Big Bore Kits

Koso MB623002 - Big Bore Cylinder Kit

Includes ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts Compression ratio of 11.5 to 1 Optional camshaft kit can be used with stock engine, but delivers improved results when used with 170cc Big Bore kit

S&S Cycle #310-1055A - 124" Power Package Engine Performance Kit - Gear Drive

124" Power Package Engine Performance Kit — 124" Made in the U.S.A. Big Bore Kit 107" to 124" Big bore kit Bolt on kit. No case machining required Forged pistons 11.1 Compression ratio Oil Pump/Cam Plate Precision machined from billet aluminum ...

S&S Cycle #310-1057B - 124" Power Package Engine Performance Kit - Chain Drive

124" Power Package Engine Performance Kit Made in the U.S.A. Big Bore Kit 107" to 124" Big bore kit Bolt on kit No case matching required Forged pistons 11:1 Compression ratio Oil Pump/Cam Plate Precision machined from billet aluminum Blue...

S&S Cycle #32-2268 - 93" Hot Set Up® Engine Performance Kit - Big Twin

93" Hot Set Up® Engine Performance Kit Kits come with 4-1/2" stroker flywheels assembled with mainshafts and rods, 3.625" bore cylinders, pistons, rings, pins and clips, S&S 514 cam, S&S Super E carb kit, valve springs, adjustable chromoly pushrods, top...

S&S Cycle #330-0662 - 100" Power Package Performance Kit - Chain Drive - Silver

100" Power Package Engine Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S...

S&S Cycle #330-0663 - 100" Power Package Performance Kit - Gear Drive - Silver

100" Power Package Engine Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S...

S&S Cycle #330-0664 - 100" Power Package Performance Kit - Chain Drive - Black

100" Power Package Engine Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S...

S&S Cycle #330-0665 - 100" Power Package Performance Kit - Gear Drive - Black

100" Power Package Engine Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S...

S&S Cycle #330-0666 - 110" Power Package Performance Kit - Chain Drive - Silver

110" Power Package Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S 585 Easy...

S&S Cycle #330-0667 - 110" Power Package Performance Kit - Gear Drive - Silver

110" Power Package Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S 585 Easy...

S&S Cycle #330-0668 - 110" Power Package Performance Kit - Chain Drive - Black

110" Power Package Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S 585 Easy...

S&S Cycle #330-0669 - 110" Power Package Performance Kit - Gear Drive - Black

110" Power Package Performance Kit Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longevity Includes an S&S 4" big-bore cylinder kit with 10.5:1 pistons, S&S 585 Easy...

S&S Cycle #900-0349 - Cylinder Heads

Super Stock™ Cylinder Heads High port flow gives great performance now, and more later when additional upgrades are done Heads are fully assembled with springs and valves Compression ratios vary depending on cylinder heads chosen, pistons used and...

S&S Cycle #900-0354 - 106" Hot Set Up® Engine Performance Kit - Black

106" Hot Set Up® Engine Performance Kit Increased fin area for better heat dissipation Increase bore size from 3.750" to 3.927" 4 3/8" stroke, 10:1 compression with stock heads Easy installation; no machining or rebalancing required Forged coated...

S&S Cycle #900-0564 - 124" Hot Set Up® Engine Performance Kit - Black

124" Hot Set Up® Engine Performance Kit The S&S Hot Set Up® kit for Twin Cams allows a Twin Cam owner to convert a stock engine to 124" using the stock crankcases Include S&S heads 91cc, 4.125” bore cylinders and forged 10.8:1 flattop pistons, S&S 4...

S&S Cycle #900-0565 - 124" Hot Set Up® Engine Performance Kit - Black

124" Hot Set Up® Engine Performance Kit The S&S Hot Setup kit for Twin Cams allows a Twin Cam owner to convert a stock engine to 124" using the stock crankcases Includes S&S heads 91cc, 4.125" bore cylinders and forged 10.8.1 flattop pistons, S&S 4...

S&S Cycle #900-0568 - 124" Hot Set Up® Engine Performance Kit - Black

124" Hot Set Up® Engine Performance Kit The S&S Hot Set Up® kit for Twin Cams allows a Twin Cam owner to convert a stock engine to 124" using the stock crankcases Include S&S heads 91cc, 4.125” bore cylinders and forged 10.8:1 flattop pistons, S&S 4...

S&S Cycle #900-0569 - 124" Hot Set Up® Engine Performance Kit - Black

124" Hot Set Up® Engine Performance Kit The S&S Hot Setup kit for Twin Cams allows a Twin Cam owner to convert a stock engine to 124" using the stock crankcases Includes S&S heads 91cc, 4.125" bore cylinders and forged 10.8.1 flattop pistons, S&S 4...

S&S Cycle #91-7660 - 96" Sidewinder® Engine Performance Kit - Natural

96" Sidewinder® Engine Performance Kit Kits include standard flywheel assembly, 3-5/8" bore cylinders, 9.75:1 pistons, rings and gaskets Does not include manifold, pushrods, or pushrod clips Made In the U.S.A. Cases must be bored to accept 3-5/8"...

S&S Cycle #91-7661 - 96" Sidewinder® Engine Performance Kit - Black

96" Sidewinder® Engine Performance Kit Kits include standard flywheel assembly, 3-5/8" bore cylinders, 9.75:1 pistons, rings and gaskets Does not include manifold, pushrods, or pushrod clips Made In the U.S.A. Cases must be bored to accept 3-5/8"...

S&S Cycle #91-9126 - 93" Sidewinder® Big Bore Stroker Engine Performance Kit

Sidewinder® Big Bore Stroker Engine Performance Kit Sidewinder Big Bore Stroker Kit Contains nearly everything needed to take a stock 74" or 80" H-D. Shovelhead engine up to 93" or 96" displacement Includes 3.625" bore high tensile, cast iron...

S&S Cycle #91-9130 - 93" Sidewinder® Big Bore Stroker Engine Performance Kit- High Compression

Sidewinder® Big Bore Stroker Engine Performance Kit Sidewinder Big Bore Stroker Kit Contains nearly everything needed to take a stock 74" or 80" H-D. Shovelhead engine up to 93" or 96" displacement Includes 3.625" bore high tensile, cast iron...

S&S Cycle #91-9134 - 96" Sidewinder® Big Bore Stroker Engine Performance Kit

Sidewinder® Big Bore Stroker Engine Performance Kit Sidewinder Big Bore Stroker Kit Contains nearly everything needed to take a stock 74" or 80" H-D. Shovelhead engine up to 93" or 96" displacement Includes 3.625" bore high tensile, cast iron...

S&S Cycle #910-0255 - Cylinders - 4.125" - Black

4-1/8" Bore Cylinder Cylinders have a stock bolt pattern Bored slightly under nominal size and are not honed Designed for 124" Hot Set Up Kits used in '99-'17 Twin Cams Wrinkle black finish with machined edges Made in the U.S.A. Requires crankcase...