Fully assembled 79 cc Super Stock® cylinder heads with large valves, high-flow ports, and S&S valve springs. Works with 88–110 cu in engines. Does not include rocker components or gaskets.
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Fully assembled heads for '06–'16 stock crankcases. Large intake and exhaust valves, high-flow ports, and S&S® valve springs supporting up to 0.650" lift. Suited for touring and heavier bikes; check compatibility for models with compression releases.
Fully assembled cylinder heads with large 1.940" intake and 1.575" exhaust valves for improved low- and midrange performance.
Deckable to 0.060" to raise compression; supports cams up to .650" lift; compatible with stock rocker boxes and manifolds.
Durable Big Bore upgrade with premium aluminum cylinders and cast-in iron liners. Kit includes pistons, rings and gaskets. Made in the USA. Requires skilled installation.
Cylinders with a stock bolt pattern, bored slightly under nominal size and left un-honed; designed for 124" hot set up kits and '99-'17 Twin Cams. Requires crankcase machining.
Complete big-bore cylinder and piston kit with forged pistons, gaskets, and hardware; ideal for stroker engine builds. Made in the U.S.A.
Direct-fit big bore kit for improved displacement and performance. Includes cylinders, pistons, rings and gaskets. Professional installation required.
Direct-fit replacement gasket kit for rocker box to prevent oil leaks and restore the seal.