Top End

Bolt in - no machining, balancing or splitting the crankcases; install can be performed with engine still in frameCast Ductile Iron Sleeve in cast aluminum for superior heat transfer88" engines are boosted to 100"96" and 103" engines are boosted 110"10...

Huge bore increase (4.320") means huge power increaseRetains stock engine heightPowder coat finish match factory finish, giving the bike a “sleeper” advantageWorks with stock crankcasesMLS (multi-layered steel) head gasketsOriginal engine serial numbers...

S&S Cycle 136" Big Bore Cylinder Kit - Black - M8 910-0849

S&S Cycle 136 " Big Bore Cylinder Kit -Black Granite/ Highlighted Fins - M8 910-0850

Revolution Performance, Llc Cylinder Kit - 131" - Granite/Highlighted Fins - Twin Cam Rp201-135W

Cylinders are constructed from premium aluminum castings with cast-in iron linersKits include cylinders, pistons, rings and gaskets (head, base and exhaust)Black powder-coat finishMade in the U.S.A.This project requires a skilled technician. It is the...

Huge displacement increase means huge power increaseWorks with stock crankcasesOriginal engine serial numbers are retainedPowder coat finish matches factory finish045" MLS (multi-layered steel) head gasketsRetains stock engine heightIncludes 131" Cam...

Huge displacement increase means huge power increaseWorks with stock crankcasesOriginal engine serial numbers are retainedPowder coat finish matches factory finish045" MLS (multi-layered steel) head gasketsRetains stock engine heightIncludes 131" Cam...

S&S heads are available to be used with stock-style flat-top pistonsKits are fully assembled, and include stainless steel valves and high-lift (.585") springsIntake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base...

Revolution Performance, Llc Cylinder Kit - 109" - Natural Silver Rp201-215W

Revolution Performance, Llc Cylinder Kit - 100" - Black With Highlighted Fins Rp201-210W

Revolution Performance, Llc Cylinder Kit - 109" - Black With Highlighted Fins Rp201-216W