{"product_id":"s-s-cycle-89-cc-super-stock-cylinder-heads-1326068500","title":"89 cc Super Stock® Cylinder Heads","description":"\u003cp\u003eCylinder Heads - Super Stock® - 89 cc - Wrinkle Black - Twin Cam\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHeads are fully assembled with springs and valves\u003c\/li\u003e\n\u003cli\u003eDesigned for '99-'05 engines with stock crankcase\u003c\/li\u003e\n\u003cli\u003eGood for touring bikes and other heavy vehicles\u003c\/li\u003e\n\u003cli\u003eWorks best for motors over 103\" or with high-compression pop-up pistons\u003c\/li\u003e\n\u003cli\u003eCombustion chamber provides a slightly higher than stock, but still manageable compression ratio in larger than stock engines\u003c\/li\u003e\n\u003cli\u003eLarge 2.000\" intake and 1.605\" exhaust valves maintain port velocity for good low and midrange response, but supply enough air for slightly larger engines to perform to their full potential\u003c\/li\u003e\n\u003cli\u003eS\u0026amp;S® High performance valve springs allow the installation of camshafts with up to .650\" lift\u003c\/li\u003e\n\u003cli\u003eIntake ports flow 264 CFM (Cubic Feet per Minute) compared to stock heads at 182 CFM\u003c\/li\u003e\n\u003cli\u003eCompatible with stock rocker boxes, exhaust, and intake manifolds\u003c\/li\u003e\n\u003cli\u003eIncludes heads and four long headbolts; and reuse four long OEM headbolts\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eMust use S\u0026amp;S rocker boxes if S\u0026amp;S compression releases are used.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecial instructions:\u003c\/strong\u003e ACCEPT OE ROCKER BOXES ?25PJL\u003c\/p\u003e","brand":"S\u0026S CYCLE","offers":[{"title":"Default Title","offer_id":54476816646462,"sku":"90-1106","price":1795.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/8384\/4926\/files\/90-1106__54707.1749165534.png?v=1789765765","url":"https:\/\/twistiesmotorsports.com\/products\/s-s-cycle-89-cc-super-stock-cylinder-heads-1326068500","provider":"TWISTIES MOTORSPORTS ","version":"1.0","type":"link"}