{"product_id":"s-s-cycle-cylinder-heads-2006-2012-harley-davidson-dyna-91cc","title":"S\u0026S Cycle Cylinder Heads — 2006-2012 Harley-Davidson Dyna 91cc","description":"\u003cp\u003eS\u0026amp;S Cycle cylinder heads for 2006-2012 Harley-Davidson Dyna 91cc engines, featuring a 4-1\/8\" bore and stock bolt pattern for direct replacement. Cast in wrinkle black finish with .650\" steel construction and -.064\" milling for precise compression and performance.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e4-1\/8\" bore diameter\u003c\/li\u003e\n  \u003cli\u003eStock bolt pattern — no adapter needed\u003c\/li\u003e\n  \u003cli\u003eWrinkle black finish\u003c\/li\u003e\n  \u003cli\u003e91cc displacement\u003c\/li\u003e\n  \u003cli\u003eSteel construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e S\u0026amp;S Cycle\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 900-0993\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 91cc\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 4-1\/8\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Wrinkle black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 28.65 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Engine Components \/ Heads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits 2006-2012 Harley-Davidson Dyna models with 91cc engines. Stock bolt pattern ensures direct bolt-on installation without adapters.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWill these heads fit my 2013+ Dyna?\u003c\/h3\u003e\n\u003cp\u003eNo — these are engineered for 2006-2012 Dyna 91cc engines. Later model years require different head specifications.\u003c\/p\u003e\n\u003ch3\u003eDo I need to upgrade my pushrods or rocker arms?\u003c\/h3\u003e\n\u003cp\u003eVerify pushrods and rocker arm compatibility with S\u0026amp;S or your builder — this depends on your complete engine build.\u003c\/p\u003e\n\u003ch3\u003eWhat's the compression ratio with these heads?\u003c\/h3\u003e\n\u003cp\u003eThe -.064\" milling surface is specified by S\u0026amp;S for use with matching pistons and cams. Consult S\u0026amp;S or your engine builder for your exact compression target.\u003c\/p\u003e\n\u003ch3\u003eIs installation a bolt-on job?\u003c\/h3\u003e\n\u003cp\u003eStock bolt pattern allows direct bolt-on replacement, but professional engine assembly is recommended for proper torque specs and gasket sealing.\u003c\/p\u003e","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":53040424812655,"sku":"T14-664035","price":1855.95,"currency_code":"USD","in_stock":false}],"url":"https:\/\/vtwinbikers.com\/products\/s-s-cycle-cylinder-heads-2006-2012-harley-davidson-dyna-91cc","provider":"Vtwinbikers","version":"1.0","type":"link"}