{"product_id":"1937-knucklehead-head-set","title":"1937 Knucklehead Head Set","description":"\u003cp\u003e1937 Knucklehead head set is accurately cast with the original factory markings for the 61 inch models and features a black finish. The heads include 61 inch intake nipples that are installed.\n\u003cbr\u003eUses 1-3\/8 inch large hex 18mm plugs. *NOTE: Valve seats are installed. \n\u003cbr\u003e Tech Notes: Suggested to use with #49-0878 18mm Doering Spark Plug Set. \n\u003cbr\u003e Instructions: http:\/\/www.vtwinmfg.com\/Instructions\/10\/10-1640.pdf\u003c\/p\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1937 Harley Davidson EL\u003cbr\u003e\n1938 Harley Davidson EL\u003cbr\u003e\n1939 Harley Davidson EL","brand":"Motortechnic","offers":[{"title":"Default Title","offer_id":55915584323752,"sku":"10-1640","price":8701.95,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/10-1640a.jpg?v=1787814254","url":"https:\/\/speedguyscanada.com\/products\/1937-knucklehead-head-set","provider":"THE SPEED GUYS CANADA ","version":"1.0","type":"link"}