S&S Cycle Mk136 Black Edition Engine With 550 G Cam For Harley Elevate your M8 H-D Touring model with the Mk136 Engine, marking the latest advancement in S&S's renowned line of complete crate engines. Engineered for unmatched power and reliability, the Mk136 combines S&S MK-Series Crankcases with 136 cylinders and flywheels, enhanced by High-flow cylinder heads featuring +1mm Valves and .605 springs. This fusion not only amplifies displacement but significantly boosts power, setting a new benchmark in engine performance. Features: High-flow cylinder heads with premium seats, guides, valves, springs, and seals +1mm oversized intake and exhaust valves Valves are .030 longer than stock for improved valvetrain geometry .605 max lift valve springs High-strength alloy used in cylinder head casting, improved strength at high temperatures Enlarged cooling passage around the exhaust seats S&S Exclusive breather boxes Patented Dual-Spray Piston Cooling Jets O-ring sealing between case and cam support plate Precision machined oil scraper Enlarged oil sump Contoured crankcase floor allows oil to easily drain back to the sump Forged pistons S&S performance oil pump and cam support plate Premium tappets and tappet cuffs Billet aluminum covers Sprocket shaft spacer included Retains stock engine height Powder coat finish matches factory finish