Big Bore & Stage Kits

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Bolt on kit, the largest cylinder bore possible without requiring machining of crankcases Includes MLS (multi-layered steel) head gaskets...

Features Converts '86-'21 883 cc and 1200 cc Sportster models to 1250 cc displacement Forged pistons have larger than stock valve pockets and acce...

Features Converts '86-'21 883 cc and 1200 cc Sportster models to 1250 cc displacement Forged pistons have larger than stock valve pockets and acce...

Features Converts '86-'21 883 cc and 1200 cc Sportster models to 1250 cc displacement Forged pistons have larger than stock valve pockets and acce...

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Bolt on 40%-50% more power for stock 107", 114" and 117" M-Eight motors Trask compressor and turbine housing with Garrett internals Trask...

Features Bolt on 40%-50% more power for stock 107", 114" and 117" M-Eight motors Trask compressor and turbine housing with Garrett internals Trask...

Features Bolt on 40%-50% more power for stock 107", 114" and 117" M-Eight motors Trask compressor and turbine housing with Garrett internals Trask...

Features Big Bore kit yields excellent results with stock cylinder heads Easy installation no need to bore or split existing cases, just swap the ...

Features Cylinders are constructed from premium aluminum castings with cast-in iron liners Kits include cylinders, pistons, rings and gaskets (hea...

Features Kit includes fitted forged pistons, pins, clips, rings, cylinders, head gaskets, base, and exhaust gaskets 10.9cc dished pistons; 10.6:1 ...

Features Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with ...

Features Cylinder and piston kit can be used to build 84", 86" or 88" stroker engines, or to replace the cylinders and piston in an engine with an...

Features Cylinder and piston kit can be used to build an 88" engine, or to replace the cylinders and piston in an engine with an existing S&S ...

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

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