S&S Cycle Big Bore & Top End

Features Heads are fully assembled with springs and valves Works great with 88" to 103" stock motors, but are ideal for larger stroker or big bore...

Features Heads are fully assembled with springs and valves Designed for stock 88" to 103" engines or slightly modified engines up to 110" Moderate...

Features Heads are fully assembled with springs and valves Designed for stock 88" to 103" engines or slightly modified engines up to 110" Moderate...

Features Heads are fully assembled with springs and valves Designed for '06-'16 engines with stock crankcase Good for touring bikes and other heav...

Features Heads are fully assembled with springs and valves Designed for '06-'16 engines with stock crankcase Good for touring bikes and other heav...

Features Heads are fully assembled with springs and valves Designed for '99-'05 engines with stock crankcase Good for touring bikes and other heav...

Features Give your Shovelhead engine that nostalgic look of a Panhead Kit consists of a set of S&S P-series cylinder heads with rocker cradles...

Features Heads come completely assembled with valve seats, valves, guides, seals, .590" lift valve springs, collars and valve keepers Kit also inc...

Features Heads are fully assembled with springs and valves Works great with 88" to 103" stock motors, but are ideal for larger stroker or big bore...

Features Fully assembled, and include stainless steel valves and high-lift springs Optimized for smaller displacement engines Available to be used...

Features Fully assembled, and include stainless steel valves and high-lift springs Optimized for smaller displacement engines Available to be used...

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

Features Kit includes 8 studs with rounded thread roots, rather than flat, improving fatigue strength 4140 Chrome Moly studs, oil quenched and tem...

Features 3.500" bore cylinders are for 80" or 89" big twins with stock, S&S® Performance, or Super Stock® heads Thicker castings, larger cooli...

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 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 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 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...

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