Big Bore & Stage Kits

Features Cylinder and piston kits contain S&S 3-1/2" bore (80") cylinders and forged pistons, rings, wrist pins, and head and base gaskets The...

Features Bolt in - no machining, balancing or splitting the crankcases; install can be performed with engine still in frame Cast Ductile Iron Slee...

Features Bolt-on without requiring machining of the crankcase Original engine serial numbers are retained MLS (multi-layered steel) head gaskets R...

Features Saves time because pistons already fit to the cylinders - ready to assemble out of the box Cylinders are constructed from premium aluminu...

Features Saves time because pistons already fit to the cylinders - ready to assemble out of the box Cylinders are constructed from premium aluminu...

Features For non-balanced Twin Cam models Converts a stock engine to 124" using the stock crankcases Include S&S Super Stock® 91 cc cylinder h...

Features For balanced Twin Cam models Converts a stock engine to 124" using the stock crankcases Includes S&S Super Stock® 91 cc cylinder head...

Features 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 hi...

Features 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 hi...

Features Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longev...

Features Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longev...

Features Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longev...

Features Cylinder fits to piston; no machining required TC3 cam support plate and TC3 oil pump to ensure consistent oil pressure and engine longev...

Features For balanced Twin Cam models Converts a stock engine to 124" using the stock crankcases Includes S&S Super Stock® 91 cc cylinder head...

Features Kit includes standard flywheel assembly, 3.625" Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gasket...

Features Kit includes standard flywheel assembly, 3.625" Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gasket...

Features Includes a set of S&S Shovelhead-style cylinder heads, a pair of S&S stock bore cylinders (3-7/16" for 74" engines or 3-1/2" for ...

Features Includes a set of S&S Shovelhead-style cylinder heads, a pair of S&S stock bore cylinders (3-7/16" for 74" engines or 3-1/2" for...

Features 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" disp...

Features Bolt on big bore kits mean easy installation with no machining and no rebalancing S&S bolt-in cams and premium tappets make the most ...

Features Increased fin area for better heat dissipation Increase bore size from 3.750" to 3.927" 4.375" stroke, 10.0:1 compression with stock head...

Features Bolt on big bore kits mean easy installation with no machining and no rebalancing S&S bolt-in cams and premium tappets make the most ...

Features Bolt on big bore kits mean easy installation with no machining and no rebalancing S&S bolt-in cams and premium tappets make the most ...

Features Bolt on big bore kits mean easy installation with no machining and no rebalancing S&S bolt-in cams and premium tappets make the most ...