{"product_id":"s-s-cycle-head-kit-4-1-8-bore-stock-bolt-pattern-650-steel-w-o-c","title":"S\u0026S Cycle Head, Kit, 4-1\/8\" Bore, Stock Bolt Pattern,.650\" Steel,w\/O C","description":"\u003cp\u003eHigh port flow gives great performance now, and more later when additional upgrades are done\u003c\/p\u003e\u003cp\u003eHeads are fully assembled with springs and valves\u003c\/p\u003e\u003cp\u003eCompression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications\u003c\/p\u003e\u003cp\u003e79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons\u003c\/p\u003e\u003cp\u003e79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs\u003c\/p\u003e\u003cp\u003eHeads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases\u003c\/p\u003e\u003cp\u003eDo not include rocker arm components, intake manifold or gaskets\u003c\/p\u003e\u003cp\u003eHeads include four long headbolts, and reuse four long OEM headbolts\u003c\/p\u003e\u003cp\u003eAccept OEM intake manifolds\u003c\/p\u003e\u003cp\u003eMade in the U.S.A.\u003c\/p\u003e\u003cp\u003eMust use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.\u003c\/p\u003e\u003cp\u003eNot compatible with Twin Cooled heads.\u003c\/p\u003e","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":40479513149486,"sku":"900-0349","price":2883.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0251\/9659\/3198\/files\/ss-cycle-head-kit-4-18-bore-stock-bolt-pattern650-steelwo-cdriven-powersports-inc900-0349-942925.png?v=1730640857","url":"https:\/\/www.drivenpowersports.ca\/products\/s-s-cycle-head-kit-4-1-8-bore-stock-bolt-pattern-650-steel-w-o-c","provider":"Driven Powersports Inc.","version":"1.0","type":"link"}