S&s cycle cyl hd 79cc 99-05 tc blk

S&S 79cc cylinder heads are intended for stock engines and other small displacement applications. These heads are compatible with stock Harley-Davidson® rocker covers. Must use S&S valve cover gasket kit part #90-4124 with stock rocker covers. They are a very economical performance upgrade designed for use with other performance enhancers and are machined to accept S&S® compression releases. Intended for larger displacement engines, S&S 89cc heads have a whopping 264cfm flow rate (compared to 182cfm for stock H-D® heads), larger valves and .640" lift valve springs. S&S recommends S&S Easy Start cams or manual or electric compression release system in order to maintain reliable engine starting on high compression applications. FEATURES AND BENEFITS: ??Heads can be decked up to .060" to increase compression ??79cc heads 1.940" intake and 1.575" exhaust valves ??S&S 0.640" lift valve springs ??Stock Harley-Davidson® rocker boxes can be retained if S&S manual compression release or S&S Easy Start cams are used. Must use S&S valve cover gasket kit part #90-4120 with stock rocker covers ??Includes 4 head bolts and rocker base gaskets to complete install