{"title":"ZIPPERS PERFORMANCE","description":"\u003cp\u003eZIPPERS PERFORMANCE\u003c\/p\u003e","products":[{"product_id":"thundermax-efi-tuners","title":"ZIPPERS THUNDERMAX EFI TUNERS HARLEY DAVIDSON MODELS","description":"\u003cp\u003eZIPPERS THUNDERMAX EFI TUNERS FOR HARLEYS\u003c\/p\u003e\n\u003cp\u003eCHOOSE YOUR YEAR AND MODEL IN OPTIONS \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes ThunderMax ECM with Auto-Tune Module, plug-in harness and two wide-band sensors, TMax software and communication USB cable, Quick-Start Easy Install and Comprehensive User's Manual, technical support and free software and updates\u003c\/li\u003e\n\u003cli\u003eHundreds of maps available to download for your bike (based on model, engine size, exhaust system air cleaner, pistons, cams, etc.) - load the map of your choice and the integral auto-tune will do the rest\u003c\/li\u003e\n\u003cli\u003eSoftware program allows live monitoring, recording and examination of diagnostic codes and datalogs 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The forged flat-top pistons used boost compression to 10.25:1, while the 528 cams yield impressive power and torque gains across the entire RPM range with stock heads. Gain even more power with (1) our optional Stage 1 headwork and (2) improve longevity with critical oil system blueprinting by adding our cam chest upgrade that includes our billet cam plate, dual-piston cam tensioners, full-compliment cam bearings and Feuling lifters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWith power peaking at 5,000 RPM, this kit is a great choice for the rider who rarely pegs the throttle to red line, but rather enjoys the super-strong pull of low and mid-range torque!\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis kit uses your factory cylinder cores sent in for modification. 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Over 100 ft\/lbs of torque is available from 2,400 to 5,200 RPM, peaking at 115+ ft\/lbs by 4,250. Horsepower is a linear line to 110+, peaking at just over 5,200 RPM – meaning you don’t have to run the RPM’s around the dial to move your big bike quickly and efficiently. Your cylinders are decked and sized for 3.937” forged pistons, while your heads are modified with Zipper’s high velocity Stage 2 CNC porting. Our Red Shift 575 cams and Dual-Piston Tensioners ensure valve train stability; Pro-Taper pushrods with EZ-Adjust covers are included with top quality gaskets. 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The rings custom sized to each cylinder.\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"128\" DISHED PISTONS (STOCK HEADS 117-128)","offer_id":55573686091944,"sku":null,"price":2799.95,"currency_code":"CAD","in_stock":true},{"title":"128\" DISHED PISTONS (MODIFIED HEADS 117-128)","offer_id":55573686124712,"sku":null,"price":2799.95,"currency_code":"CAD","in_stock":true},{"title":"128\" FLAT TOP PISTONS ( MODIFIED HEADS 117-128)","offer_id":55573686157480,"sku":null,"price":2799.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIPBIGBOREKIT_d940a2f3-90fb-4bd6-a727-2411eb329695.jpg?v=1780288633"},{"product_id":"zippers-performance-big-bore-kits-harley-gen-2-m8-models-copy","title":"ZIPPERS PERFORMANCE BIG BORE KITS HARLEY TWIN CAMS 99-06","description":"\u003cp\u003eZIPPERS PERFORMANCE BIG BORE KITS HARLEY TWIN CAMS 99-06\u003c\/p\u003e\n\u003cp\u003eSELECT IN OPTIONS \u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eKITS FOR 1999-2006 TWIN CAM® ENGINES\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eFactory 1999-2006 Twin Cam® engines are equipped with 4” stroke crankshafts. The factory cylinder bore size of 3-3\/4” yields the 88” displacement. We can turn your 88” engine into either a 95 or a 98”, simply by resizing the factory cylinders.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"95\" DOMED 10.5:1 \/ BLACK","offer_id":55573687140520,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"95\" DOMED 10.5:1 \/ SILVER","offer_id":55573687173288,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"95\" DOMED 10:1 \/ BLACK","offer_id":55573687206056,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"95\" DOMED 10:1 \/ SILVER","offer_id":55573687238824,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"95\" DOMED 9.25:1 \/ BLACK","offer_id":55573687271592,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"95\" DOMED 9.25:1 \/ SILVER","offer_id":55573687304360,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"98\" DOMED 10.75:1 \/ BLACK","offer_id":55573687337128,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true},{"title":"98\" DOMED 10.75:1 \/ SILVER","offer_id":55573687369896,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true},{"title":"98\" DOMED 10.25:1 \/ BLACK","offer_id":55573687402664,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true},{"title":"98\" DOMED 10.25:1 \/ SILVER","offer_id":55573687435432,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true},{"title":"98\" DOMED 10:1 \/ BLACK","offer_id":55573687468200,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true},{"title":"98\" DOMED 10:1 \/ SILVER","offer_id":55573687500968,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true},{"title":"98\" FLAT TOP 9.5:1 \/ BLACK","offer_id":55573687533736,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true},{"title":"98\" FLAT TOP 9.5:1 \/ SILVER","offer_id":55573687566504,"sku":null,"price":2699.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIPBIGBOREKIT_5234d385-82a0-472b-918a-5ca49cda8a3f.jpg?v=1780288657"},{"product_id":"zippers-performance-big-bore-kits-harley-twin-cams-99-06-copy","title":"ZIPPERS PERFORMANCE BIG BORE KITS HARLEY TWIN CAMS 07-17","description":"\u003cp\u003eZIPPERS PERFORMANCE BIG BORE KITS HARLEY TWIN CAMS 07-17\u003c\/p\u003e\n\u003cp\u003eSELECT IN OPTIONS \u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eKITS FOR 2007-UP TWIN CAM® ENGINES\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eFactory 2007-up Twin Cam® engines are equipped with 4-3\/8” stroke crankshafts. The factory cylinder bore size of 3-3\/4” yields the 96” displacement, which was gradually increased to 3-7\/8” starting in 2010 for 103” displacement. We can turn your 96” engine into either a 103 or a 107”, and your 103 into a 107” simply by resizing the factory cylinders.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"103\" DOMED 10.5:1 \/ BLACK","offer_id":55573688942760,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"103\" DOMED 10.5:1 \/ SILVER","offer_id":55573688975528,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"103\" FLAT TOP 10:1 \/ BLACK","offer_id":55573689008296,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"103\" FLAT TOP 10:1 \/ SILVER","offer_id":55573689041064,"sku":null,"price":2399.95,"currency_code":"CAD","in_stock":true},{"title":"107\" DOMED 10.75:1 \/ BLACK","offer_id":55573689073832,"sku":null,"price":2599.95,"currency_code":"CAD","in_stock":true},{"title":"107\" DOMED 10.75:1 \/ SILVER","offer_id":55573689106600,"sku":null,"price":2599.95,"currency_code":"CAD","in_stock":true},{"title":"107\" FLAT TOP 10.25:1 \/ BLACK","offer_id":55573689139368,"sku":null,"price":2599.95,"currency_code":"CAD","in_stock":true},{"title":"107\" FLAT TOP 10.25:1 \/ SILVER","offer_id":55573689172136,"sku":null,"price":2599.95,"currency_code":"CAD","in_stock":true},{"title":"107\" DOMED 11:1 \/ BLACK","offer_id":55573689204904,"sku":null,"price":2599.95,"currency_code":"CAD","in_stock":true},{"title":"107\" DOMED 11:1 \/ SILVER","offer_id":55573689237672,"sku":null,"price":2599.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIPBIGBOREKIT_e8576a24-7fe1-4a56-a777-fa2ad7442366.jpg?v=1780288681"},{"product_id":"zippers-performance-big-bore-kits-harley-twin-cams-07-17-copy","title":"ZIPPERS PERFORMANCE BIG BORE KITS 124\" HARLEY TWIN CAMS 99-17","description":"\u003cp\u003eZIPPERS PERFORMANCE BIG BORE KITS 124\" HARLEY TWIN CAMS 99-17\u003c\/p\u003e\n\u003cp\u003eSELECT IN OPTIONS \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThese cylinders, when used with our 4-5\/8” stroker crankshaft, increase displacement to 124”. Complete kits include cylinders, forged flat top piston kit, head and base gaskets. Requires case boring (instructions included) and stroker piston cooling jet kit. These cylinders are .183” longer than stock and require a wider intake manifold. Fits in all frames.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThese cylinders, when used with our 4-5\/8” stroker crankshaft, increase displacement to 124”. Complete kits include cylinders, forged flat top piston kit, head and base gaskets. Requires case boring (instructions included) and stroker piston cooling jet kit. These cylinders are .183” longer than stock and require a wider intake manifold. Fits in all frames.\u003c\/p\u003e\n\u003cp\u003eZippers 4-1\/8” bore cylinders allow the Twin Cam® owner the ability to increase their engine’s displacement with the largest bore you can safely fit to the stock case. These are completely new aluminum cylinders, cast around a .240” thick iron liner, 60% thicker than the stock cylinder liner. This thicker liner reduces twist and flex in an aluminum cylinder, providing a very stable bore for the rings to maintain seal. These cylinders can be ordered with the bore undersize for final fit by the purchaser, or sized by Zippers with our 4-1\/8” big bore pistons. Top them off with our CNC ported TC cylinder heads, for a complete top end performance package. Installation requires engine disassembly for case boring (a service available from our machine shop). Cylinder\/piston kits include head and base gaskets (cylinders-only do not include gaskets, order separately). Available in as-cast aluminum finish or powder-coated black with machined finsh.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"BLACK","offer_id":55573690056872,"sku":null,"price":3599.95,"currency_code":"CAD","in_stock":true},{"title":"SILVER","offer_id":55573690089640,"sku":null,"price":3599.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIPBIGBOREKIT_1f5f1582-dd63-43cc-a2a6-a4b9bb4a5a1f.jpg?v=1780288707"},{"product_id":"zippers-performance-big-bore-kits-harley-twin-cams-07-17-copy-1","title":"ZIPPERS PERFORMANCE 110\" CVO SLEEPER BIG BORE KIT HARLEY TC 07-17","description":"\u003cp\u003eZIPPERS PERFORMANCE 110\" CVO SLEEPER BIG BORE KIT HARLEY TC 07-17\u003c\/p\u003e\n\u003cp\u003eCORE EXCHANGE REQUIRED\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwin Cam® CVO Sleeper 110 Kit\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eWake up your CVO 110 with our Sleeper 110 Kit!\u003c\/strong\u003e\u003cem\u003e\u003cbr\u003eThe 255 cams the factory installed in the 110 have a narrow profile that limits horsepower. Adding a broader profile cam allows the engine to rev more freely but also lowers the dynamic compression ratio and can hurt low end torque. We studied the issue and found that our Red Shift 576 grind, coupled with a small bump in compression (10:1) should boost power across the board – and it did, quite nicely! The Sleeper 110 kit includes forged, +4.2cc pistons, Red Shift 576 cams and Dual-Piston tensioners, Pro-Taper pushrods and E-Z Adjust covers (your choice of chrome or black finish) and necessary gaskets.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eResult: 28% gain in HP, 17% in torque!\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eCVO engines are known for oil delivery and lifter issues, so our 417-498 blueprinted cam chest upgrade is a highly recommended option.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis kit uses your factory cylinder cores sent in for modification.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"BLACK","offer_id":55573698904232,"sku":null,"price":3499.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME","offer_id":55573698937000,"sku":null,"price":3499.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIP_110_SLEEPER.jpg?v=1780288925"},{"product_id":"zippers-performance-110-cvo-sleeper-big-bore-kit-harley-tc-07-17-copy","title":"ZIPPERS PERFORMANCE 110\" CVO SPORT BIG BORE KIT HARLEY TC 07-17","description":"\u003cp\u003eZIPPERS PERFORMANCE 110\" CVO SPORT BIG BORE KIT HARLEY TC 07-17\u003c\/p\u003e\n\u003cp\u003eCORE EXCHANGE REQUIRED\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTwin Cam® CVO Sport 110 Kit\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003e\u003cstrong\u003eZipper’s Sport 110 kit greatly improves the 110’s power all across the board.\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eLike the Sleeper 110, cam timing and compression are both increased for impressive power gains. We chose the popular Red Shift 577 cams, a more aggressive grind that responds well to compression. After decking the gasket surface on your supplied cylinders, forged +10cc domed pistons (10.65:1) are precision-fitted to the cylinders using the latest Sunnen honing techniques. The kit also includes Red Shift Dual-Piston tensioners, Pro-Taper pushrods and E-Z Adjust covers (your choice of chrome or black finish), and all necessary gaskets.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e\u003cem\u003eResult: 39% gain in HP, 17% in big, broad torque!\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eCVO engines are known for oil delivery and lifter issues, so our 417-498 blueprinted cam chest upgrade is a highly recommended option.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis kit uses your factory cylinder cores sent in for modification.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"BLACK","offer_id":55573699559592,"sku":null,"price":3699.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME","offer_id":55573699592360,"sku":null,"price":3699.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIP_110_SLEEPER_6a85280a-346d-46f8-a866-abdfd8f072e4.jpg?v=1780288950"},{"product_id":"zippers-performance-110-cvo-sport-big-bore-kit-harley-tc-07-17-copy","title":"ZIPPERS PERFORMANCE 110\" CVO MUSCLE BIG BORE KIT HARLEY TC 07-17","description":"\u003cp\u003eZIPPERS PERFORMANCE 110\" CVO MUSCLE BIG BORE KIT HARLEY TC 07-17\u003c\/p\u003e\n\u003cp\u003eCORE EXCHANGE REQUIRED\u003c\/p\u003e\n\u003cdiv class=\"col-lg-6 col-md-6 col-sm-12 product-information\"\u003e\n\u003cdiv class=\"product-information-inner\"\u003e\n\u003cdiv class=\"fixed-content\"\u003e\n\u003ch1 class=\"product_title entry-title\"\u003eZipper’s Muscle 110″ Kit for 2007-2017 CVO Twin Cam®\u003c\/h1\u003e\n\u003cp class=\"price\"\u003e \u003c\/p\u003e\n\u003cdiv class=\"woocommerce-product-details__short-description\"\u003e\n\u003cp\u003e\u003cstrong\u003eZipper’s Twin Cam® CVO Muscle 110 Kit\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eDoes your CVO 110 seem to run flat after 4,500 RPM?\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003eIt’s true – the factory 110 engine is better at producing torque than HP. Zipper’s Muscle 110 kit starts producing more torque at 2,500, then just when the factory engine starts leveling out at 4,250, the Muscle 110 takes a deep breath and charges hard to 6,200 RPM – making an astonishing 40 HP more! Peak torque occurs at 5,100 RPM, 34 ft\/lbs more that stock, contributing to the hard pull on felt in your arms. How do we do it? Zipper’s Stage III CVO CNC porting, proprietary +10cc pistons and Red Shift 657 cams provide everything needed to produce the power. Valve springs and Red Shift Dual-Piston tensioners with Pro-Taper pushrods add stability and life to the unstable factory valve train.\u003cbr\u003e\u003cem\u003e\u003cstrong\u003eWhether you ride in short hops or long trips, you’ll fall in love with your CVO again with the Muscle 110!\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eCVO engines are known for lifter and oil system issues, so our blueprinted cam chest upgrade is highly recommended.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis kit uses your factory head and cylinder cores sent in for modification.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"BLACK","offer_id":55573700280488,"sku":null,"price":6499.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME","offer_id":55573700313256,"sku":null,"price":6499.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIP_110_CVO_MUSCLE.jpg?v=1780288974"},{"product_id":"zippers-performance-110-cvo-muscle-big-bore-kit-harley-tc-07-17-copy","title":"ZIPPERS PERFORMANCE 113\" CVO MUSCLE BIG BORE KIT HARLEY TC 07-17","description":"\u003cp\u003eZIPPERS PERFORMANCE 113\" CVO MUSCLE BIG BORE KIT HARLEY TC 07-17\u003c\/p\u003e\n\u003cp\u003eCORE EXCHANGE REQUIRED\u003c\/p\u003e\n\u003cdiv class=\"col-lg-6 col-md-6 col-sm-12 product-images product-thumbnails-shown\"\u003e\n\u003cdiv class=\"swiper-entry swipers-couple-wrapper images images-wrapper with-pswp woocommerce-product-gallery arrows-hovered\"\u003e\n\u003cdiv class=\"swiper-control-top swiper-container main-slider-on gallery-slider-on swiper-swiper-unique-id-0 initialized swiper-container-initialized swiper-container-horizontal swiper-container-autoheight second-initialized\" data-autoheight=\"true\" data-effect=\"slide\" data-space=\"10\" id=\"swiper-unique-id-0\"\u003e\n\u003cdiv aria-live=\"polite\" class=\"swiper-wrapper main-images\" id=\"swiper-wrapper-f1e404107ff87f886\"\u003e\n\u003cdiv aria-label=\"2 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper swiper-slide-next\" role=\"group\"\u003e\n\u003cdiv class=\"woocommerce-product-gallery__image\" data-thumb=\"\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv aria-label=\"3 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper\" role=\"group\"\u003e\n\u003cdiv class=\"woocommerce-product-gallery__image\" data-thumb=\"\"\u003e\n\u003cp\u003e\u003cstrong\u003eZipper’s Twin Cam® CVO Muscle 113 Kit\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eWhat could be better than our Muscle 110 kit?\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003eAdding 3 magical cubic inches to it, of course! By adding .060” to the bore and 2cc’s to the pistons, a sweet spot was identified, and the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMuscle 113\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewas born – with nearly 11 more HP and 9 more ft\/lbs of torque. The Muscle 113 has a very similar power curve when compared to the Muscle 110, just more of it, everywhere. 50 more horsepower and 42 ft\/lbs of torque than stock! Zipper’s Stage III CVO CNC porting, proprietary +12cc pistons and Red Shift 657 cams provide everything needed to produce the power. Upgraded valve springs and Red Shift Dual-Piston tensioners with Pro-Taper pushrods add stability and life to the unstable factory valve train, up through 6,500 RPM. \u003cspan\u003e \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003eBig Power awaits the CVO owner with this powerful top end and cam kit! M8 owners will respect the Twin Cam® Muscle 113!\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eCVO engines are known for lifter and oil delivery issues, so our 417-498 blueprinted cam chest upgrade is highly recommended\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis kit uses your factory head and cylinder cores sent in for modification.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv aria-label=\"4 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper\" role=\"group\"\u003e\n\u003cdiv class=\"woocommerce-product-gallery__image\" data-thumb=\"\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv aria-controls=\"swiper-wrapper-f1e404107ff87f886\" aria-disabled=\"true\" aria-label=\"Previous slide\" class=\"swiper-custom-left swiper-button-prev-swiper-unique-id-0 swiper-button-disabled\" role=\"button\" tabindex=\"-1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cspan aria-atomic=\"true\" aria-live=\"assertive\" class=\"swiper-notification\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"swiper-container swiper-control-bottom columns-3 no-arrows slider swiper-swiper-unique-id-1 initialized swiper-container-initialized swiper-container-horizontal second-initialized\" data-breakpoints=\"1\" data-clickedslide=\"1\" data-lt-slides=\"4\" data-md-slides=\"4\" data-slides-per-view=\"4\" data-sm-slides=\"4\" data-spacebetween=\"10\" data-xs-slides=\"3\" id=\"swiper-unique-id-1\"\u003e\n\u003cdiv class=\"et-loader\"\u003e\u003csvg class=\"loader-circular\" height=\"30\" viewbox=\"25 25 50 50\" width=\"30\"\u003e\u003ccircle class=\"loader-path\" cx=\"50\" cy=\"50\" fill=\"none\" r=\"20\" stroke-miterlimit=\"10\" stroke-width=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cspan aria-atomic=\"true\" aria-live=\"assertive\" class=\"swiper-notification\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"col-lg-6 col-md-6 col-sm-12 product-information\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"BLACK","offer_id":55573702574248,"sku":null,"price":6499.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME","offer_id":55573702607016,"sku":null,"price":6499.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIP_110_CVO_MUSCLE_5fada471-152c-4e29-8825-5d69fbcd087b.jpg?v=1780289001"},{"product_id":"zippers-performance-113-cvo-muscle-big-bore-kit-harley-tc-07-17-copy","title":"ZIPPERS PERFORMANCE 124\" CVO MUSCLE BIG BORE KIT HARLEY TC 07-17","description":"\u003cp\u003eZIPPERS PERFORMANCE 124\" CVO MUSCLE BIG BORE KIT HARLEY TC 07-17\u003c\/p\u003e\n\u003cp\u003eCORE EXCHANGE REQUIRED\u003c\/p\u003e\n\u003cdiv class=\"col-lg-6 col-md-6 col-sm-12 product-images product-thumbnails-shown\"\u003e\n\u003cdiv class=\"swiper-entry swipers-couple-wrapper images images-wrapper with-pswp woocommerce-product-gallery arrows-hovered\"\u003e\n\u003cdiv class=\"swiper-control-top swiper-container main-slider-on gallery-slider-on swiper-swiper-unique-id-0 initialized swiper-container-initialized swiper-container-horizontal swiper-container-autoheight second-initialized\" data-autoheight=\"true\" data-effect=\"slide\" data-space=\"10\" id=\"swiper-unique-id-0\"\u003e\n\u003cdiv aria-live=\"polite\" class=\"swiper-wrapper main-images\" id=\"swiper-wrapper-f1e404107ff87f886\"\u003e\n\u003cdiv aria-label=\"2 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper swiper-slide-next\" role=\"group\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv aria-label=\"3 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper\" role=\"group\"\u003e\n\u003cdiv class=\"woocommerce-product-gallery__image\" data-thumb=\"\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eRaise the bar to the top level on your CVO Twin Cam®!\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e Zipper’s CVO Muscle 124 engine kit improves the high-breathing CVO head with Zipper’s CNC porting and oversize valves, while our proprietary +7cc domed pistons raise compression to 10.75:1. A new 4-5\/8” crankshaft adds a ¼” more stroke, while new stress-relieved cylinders add an 1\/8” more to the bore. Our Red Shift 657 cams are perfectly matched with the heads and piston to provide big torque \u0026amp; HP across the entire RPM range. Red Shift Dual-Piston cam tensioners are included with Pro-Taper pushrods and EZ-Adjust covers for a stable valve train, with all the gaskets needed for assembly. Case boring required for 4-1\/8” cylinders; Timken® bearing conversion and cam chest\/oil system upgrade highly recommended to improve durability and reliability. \u003c\/span\u003e\u003cstrong\u003e\u003cem\u003eMake your\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eCVO run even faster than it looks!\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv aria-label=\"4 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper\" role=\"group\"\u003e\n\u003cdiv class=\"woocommerce-product-gallery__image\" data-thumb=\"\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv aria-controls=\"swiper-wrapper-f1e404107ff87f886\" aria-disabled=\"true\" aria-label=\"Previous slide\" class=\"swiper-custom-left swiper-button-prev-swiper-unique-id-0 swiper-button-disabled\" role=\"button\" tabindex=\"-1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cspan aria-atomic=\"true\" aria-live=\"assertive\" class=\"swiper-notification\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"swiper-container swiper-control-bottom columns-3 no-arrows slider swiper-swiper-unique-id-1 initialized swiper-container-initialized swiper-container-horizontal second-initialized\" data-breakpoints=\"1\" data-clickedslide=\"1\" data-lt-slides=\"4\" data-md-slides=\"4\" data-slides-per-view=\"4\" data-sm-slides=\"4\" data-spacebetween=\"10\" data-xs-slides=\"3\" id=\"swiper-unique-id-1\"\u003e\n\u003cdiv class=\"et-loader\"\u003e\u003csvg class=\"loader-circular\" height=\"30\" viewbox=\"25 25 50 50\" width=\"30\"\u003e\u003ccircle class=\"loader-path\" cx=\"50\" cy=\"50\" fill=\"none\" r=\"20\" stroke-miterlimit=\"10\" stroke-width=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cspan aria-atomic=\"true\" aria-live=\"assertive\" class=\"swiper-notification\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"col-lg-6 col-md-6 col-sm-12 product-information\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"BLACK \/ TC A TOURING DYNA","offer_id":55573703360680,"sku":null,"price":12599.95,"currency_code":"CAD","in_stock":true},{"title":"BLACK \/ TC B SOFTAILS","offer_id":55573703393448,"sku":null,"price":12599.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME \/ TC A TOURING DYNA","offer_id":55573703426216,"sku":null,"price":12599.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME \/ TC B SOFTAILS","offer_id":55573703458984,"sku":null,"price":12599.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIP_124_CVO.jpg?v=1780289028"},{"product_id":"zippers-performance-113-cvo-muscle-big-bore-kit-harley-tc-07-17-copy-1","title":"ZIPPERS PERFORMANCE 107\" MUSCLE BIG BORE KIT HARLEY TC 99-06","description":"\u003cp\u003eZIPPERS PERFORMANCE 107\" MUSCLE BIG BORE KIT HARLEY TC 99-06\u003c\/p\u003e\n\u003cp\u003eCORE EXCHANGE REQUIRED\u003c\/p\u003e\n\u003cdiv class=\"col-lg-6 col-md-6 col-sm-12 product-images product-thumbnails-shown\"\u003e\n\u003cdiv class=\"swiper-entry swipers-couple-wrapper images images-wrapper with-pswp woocommerce-product-gallery arrows-hovered\"\u003e\n\u003cdiv class=\"swiper-control-top swiper-container main-slider-on gallery-slider-on swiper-swiper-unique-id-0 initialized swiper-container-initialized swiper-container-horizontal swiper-container-autoheight second-initialized\" data-autoheight=\"true\" data-effect=\"slide\" data-space=\"10\" id=\"swiper-unique-id-0\"\u003e\n\u003cdiv aria-live=\"polite\" class=\"swiper-wrapper main-images\" id=\"swiper-wrapper-f1e404107ff87f886\"\u003e\n\u003cdiv aria-label=\"2 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper swiper-slide-next\" role=\"group\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv aria-label=\"3 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper\" role=\"group\"\u003e\n\u003cdiv class=\"woocommerce-product-gallery__image\" data-thumb=\"\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eLooking for a Big Power Boost for your ’99-’06 Twin Cam?\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e Zipper’s Muscle 107 kit will \u003c\/span\u003e\u003cstrong\u003edouble\u003c\/strong\u003e\u003cspan\u003e the HP of a TC 88” engine – all while looking stock from the outside! A new 4-3\/8” stroke crankshaft replaces the original 4” crank, while your cylinders are decked and precision fit with 3.937” 10.6:1 pistons. Your heads receive Zipper’s Stage III CNC porting with new guides, oversize valves, performance springs and manual compression releases. Our Red Shift 577 cams provide big torque \u0026amp; HP gains across the entire RPM range. Also included are Pro-Taper pushrods and EZ-Adjust covers, with all gaskets needed for assembly. Highly recommended option: Zipper’s #417-495 blueprinted cam chest upgrade with our Red Shift Dual Piston hydraulic cam chain tensioners, blueprinted billet plate, HV oil pump, cam bearings and quality USA lifters for improved reliability and durability. \u003c\/span\u003e\u003cstrong\u003eAmazing New Life for the 1st Generation Twin Cam® – M8’s BEWARE!\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv aria-label=\"4 \/ 4\" class=\"swiper-slide images woocommerce-product-gallery woocommerce-product-gallery__wrapper\" role=\"group\"\u003e\n\u003cdiv class=\"woocommerce-product-gallery__image\" data-thumb=\"\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv aria-controls=\"swiper-wrapper-f1e404107ff87f886\" aria-disabled=\"true\" aria-label=\"Previous slide\" class=\"swiper-custom-left swiper-button-prev-swiper-unique-id-0 swiper-button-disabled\" role=\"button\" tabindex=\"-1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cspan aria-atomic=\"true\" aria-live=\"assertive\" class=\"swiper-notification\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"swiper-container swiper-control-bottom columns-3 no-arrows slider swiper-swiper-unique-id-1 initialized swiper-container-initialized swiper-container-horizontal second-initialized\" data-breakpoints=\"1\" data-clickedslide=\"1\" data-lt-slides=\"4\" data-md-slides=\"4\" data-slides-per-view=\"4\" data-sm-slides=\"4\" data-spacebetween=\"10\" data-xs-slides=\"3\" id=\"swiper-unique-id-1\"\u003e\n\u003cdiv class=\"et-loader\"\u003e\u003csvg class=\"loader-circular\" height=\"30\" viewbox=\"25 25 50 50\" width=\"30\"\u003e\u003ccircle class=\"loader-path\" cx=\"50\" cy=\"50\" fill=\"none\" r=\"20\" stroke-miterlimit=\"10\" stroke-width=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cspan aria-atomic=\"true\" aria-live=\"assertive\" class=\"swiper-notification\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"col-lg-6 col-md-6 col-sm-12 product-information\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"BLACK \/ TC A TOURING DYNA","offer_id":55573704114344,"sku":null,"price":9699.95,"currency_code":"CAD","in_stock":true},{"title":"BLACK \/ TC B SOFTAIL","offer_id":55573704147112,"sku":null,"price":9699.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME \/ TC A TOURING DYNA","offer_id":55573704179880,"sku":null,"price":9699.95,"currency_code":"CAD","in_stock":true},{"title":"CHROME \/ TC B SOFTAIL","offer_id":55573704212648,"sku":null,"price":9699.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIP_107_MUSCLE_9906.jpg?v=1780289052"},{"product_id":"zippers-performance-thundersport-cylinder-heads-harley-m8","title":"ZIPPERS PERFORMANCE THUNDERSPORT CYLINDER HEADS HARLEY M8","description":"\u003cp\u003eZIPPERS PERFORMANCE THUNDERSPORT CYLINDER HEADS HARLEY M8 \u003c\/p\u003e\n\u003cp\u003eSELECT LEVEL OF HEADWORK IN OPTIONS \u003c\/p\u003e\n\u003cp\u003eTHESE ARE AN EXCHANGE ITEM \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 2 -head upgrade begins with an inspection of the seats, guides and valves. After the seat integrity inspection is completed the valves and seats are professionally machined and blended to provide maximum flow in an un-ported head to achieve power and concentricity without the cost of ported heads. This process offers superior flow and sealing over the OE or a SE head. Heads are decked and fully assembled, ready for installation. Before decking approximate cc volume 89-90 cc\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 3 -The 4-valve M8 cylinder head flows considerably more air than previous 2-valve heads – but it needs to, to support today’s larger engines. Flow testing the stock heads shows an imbalance between intake and exhaust flow ratios. Our combination of qualifying seat installation, CNC porting, professional seat and guide finishing with oversize valves, careful spring set up and decking ensures you will extract maximum power from your engine modifications while improving the flow imbalance. This work is performed on your supplied head cores.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSTAGE 3.1-\u003cspan\u003eSimilar to the STAGE 3 head, this fully developed CNC ported head has excellent flow that makes huge improvements required for large displacement M8 engines. This design has improved velocity helps make excellent early torque and peak HP.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 4-\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis is Zipper’s newest fully developed CNC ported head designed for larger output engines. This head has large increases in flow over the STAGE 3 and tightens the spread between Intake to Exhaust flow ratio with significant improvements to the exhaust port design.\u003c\/p\u003e\n\u003cp\u003eOnly for use on big bore M8 engines. O.S. Valves are + 2mm 42\/34 intake \/ exhaust valves.  Requires oversized Induction. Final combustion chamber cc range 89-90 cc.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThis service is available for Oil Cooled- Twin Cooled heads\u003c\/li\u003e\n\u003cli\u003ePorting performed with guides removed\u003c\/li\u003e\n\u003cli\u003eIncluded are Upgraded Valve Springs and New Guides\u003c\/li\u003e\n\u003cli\u003eOversize valve seat replacement is required with 4.0\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZIPPERS","offers":[{"title":"STAGE 1","offer_id":55576913346728,"sku":null,"price":2599.95,"currency_code":"CAD","in_stock":true},{"title":"STAGE 2 CNC","offer_id":55576913379496,"sku":null,"price":3995.95,"currency_code":"CAD","in_stock":true},{"title":"STAGE 3 CNC","offer_id":55576913412264,"sku":null,"price":3899.95,"currency_code":"CAD","in_stock":true},{"title":"STAGE 4 CNC","offer_id":55576913445032,"sku":null,"price":4899.95,"currency_code":"CAD","in_stock":true},{"title":"STAGE 4 CNC TITANIUM","offer_id":55576913477800,"sku":null,"price":5099.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIPPERSM8HEADS.jpg?v=1780376081"},{"product_id":"zippers-performance-thundersport-cylinder-heads-harley-m8-copy","title":"ZIPPERS PERFORMANCE THUNDERSPORT CYLINDER HEADS HARLEY M8 GEN 2","description":"\u003cp\u003eZIPPERS PERFORMANCE THUNDERSPORT CYLINDER HEADS HARLEY M8 GEN 2\u003c\/p\u003e\n\u003cp\u003eSELECT LEVEL OF HEADWORK IN OPTIONS \u003c\/p\u003e\n\u003cp\u003eTHESE ARE AN EXCHANGE ITEM \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 2-Zipper’s Gen2 Stage 2 head upgrade begins with an inspection of the cylinder head as received; seats, guides and valves are all inspected for unusual wear or issues. After the inspection is completed, the valves and seats are professionally machined and blended to provide maximum flow in an un-ported head to achieve power and concentricity without the cost of ported heads. This process offers superior flow and sealing over the OE or a SE head. Heads are decked and fully assembled, ready for installation. Before decking approximate cc volume is 89-90 cc, which can be paired with multiple different compression pistons for various outputs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSTAGE 3-The Zipper’s CNC ported heads for center-cooled engines were developed in conjunction with the Zipper’s Muscle Stage 3 kit. They feature beautifully shaped port designed to maximize velocity and flow to produce incredible torque and horsepower for your next engine build.\u003c\/p\u003e\n\u003cp\u003eThis package includes larger intake seats and +1mm stainless intake and exhaust valves, to complement the complex shapes of the ports and precision valve seat machining.  All work is professionally machined and blended to perfection, to provide superior flow and sealing over OE or SE heads.\u003c\/p\u003e\n\u003cp\u003eThe unique intake port shape of the center-cooled Gen 2 cylinder head is port-matched to the larger SE 68mm throttle body and manifold system.\u003c\/p\u003e\n\u003cp\u003eProvide a compression ratio target + piston dome volume, and the heads will be decked, cleaned and assembled ready to mount on the new engine.\u003c\/p\u003e\n\u003cp\u003eRequired:  your center cooled castings safely packaged and shipped to Zipper’s.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"ZIPPERS","offers":[{"title":"STAGE 2","offer_id":55576914591912,"sku":null,"price":3699.95,"currency_code":"CAD","in_stock":true},{"title":"STAGE 3 CNC","offer_id":55576914624680,"sku":null,"price":4995.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/ZIPPERSM8HEADS_9ff4462b-617c-422c-a8b3-18c5ca845224.jpg?v=1780376105"},{"product_id":"zippers-performance-thundersport-cylinder-heads-harley-m8-copy-1","title":"ZIPPERS PERFORMANCE THUNDERSPORT CYLINDER HEADS HARLEY TC 99-05","description":"\u003cp\u003eZIPPERS PERFORMANCE THUNDERSPORT CYLINDER HEADS HARLEY TC 99-05\u003c\/p\u003e\n\u003cp\u003eSELECT LEVEL OF HEADWORK IN OPTIONS \u003c\/p\u003e\n\u003cp\u003eTHESE ARE AN EXCHANGE ITEM \u003c\/p\u003e\n\u003cp\u003eSTAGE 1.8-\u003cspan\u003eThe Stage 1.8 is a fully CNC Ported head designed for 95, 98, 103, or 107 engines. The 1.850” O.S. Valves, new guides and 7mm conical springs. The application allows use with OE piston with shallow valve pockets or engine builder looking for little extra low end response. The head gasket surface will be decked to assure a true\/flat sealing surface. Combustion chamber volume is approximately 85-86.5 cc.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 2-Our Stage II CNC heads employ special high velocity ports developed specifically for riders in search of early torque with broad power. With ports designed for high-velocity airflow, matching these heads with the proper camshaft and exhaust produces amazing power. Perfect for riders of heavier machines who want great acceleration just by turning the throttle – no rowing of the gearbox and high RPM needed!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSTAGE 3-\u003cspan\u003eOur Stage III ThunderSport heads are the perfect choice for 3.875 – 3.937” bore Twin Cam® engines with all the highs – high compression, high flow throttle body, high flow exhaust and high output at all RPM’s! Our original design has been fully refined to fulfill the airflow needs of the highly modified Twin Cam® engine with displacement ranging from 95 to 107 cubic inches.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 3.5 MCR-The Zipper’s Performance Stage 3.5 heads with Manual Compression Releases have a special high flow port design that is one of\u003cbr\u003ethe largest we can machine into an O.E castings. Special O.S. 2.00” valves, Step Lock Guides, special valve seat machining, 5\/16” dual spring for lift up to .675”. 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The 1.850” O.S. Valves, new guides and 7mm conical springs. The application allows use with OE piston with shallow valve pockets or engine builder looking for little extra low end response. The head gasket surface will be decked to assure a true\/flat sealing surface. Combustion chamber volume is approximately 85-86.5 cc.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 2-Our Stage II CNC heads employ special high velocity ports developed specifically for riders in search of early torque with broad power. With ports designed for high-velocity airflow, matching these heads with the proper camshaft and exhaust produces amazing power. Perfect for riders of heavier machines who want great acceleration just by turning the throttle – no rowing of the gearbox and high RPM needed!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSTAGE 3-\u003cspan\u003eOur Stage III ThunderSport heads are the perfect choice for 3.875 – 3.937” bore Twin Cam® engines with all the highs – high compression, high flow throttle body, high flow exhaust and high output at all RPM’s! Our original design has been fully refined to fulfill the airflow needs of the highly modified Twin Cam® engine with displacement ranging from 95 to 107 cubic inches.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSTAGE 3.5 MCR-The Zipper’s Performance Stage 3.5 heads with Manual Compression Releases have a special high flow port design that is one of\u003cbr\u003ethe largest we can machine into an O.E castings. Special O.S. 2.00” valves, Step Lock Guides, special valve seat machining, 5\/16” dual spring for lift up to .675”. 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