Crankcase & Bottom End

Crankcase Breather Reed Valve for 1984-'99 bt. Available in standard size or +.030" for use in engines with damaged breather bores New-style breat...

Made from 4140 heat-treated steel for maximum wear-resistance Rounded teeth for smoother, quieter rolling Reinforced stop-peg prevents breakage in...

Cast from A356 T-6 heat-treated aluminum alloy Includes crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic dra...

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank po...

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank po...

Cast from A356 T-6 heat-treated aluminum alloy Include crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drai...

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank po...

Perfect for stock replacement and high performance applications in 1992-' 99 Harley-Davidson® big twin models. This 3-1/2" (stock) bore crankcase o...

Perfect for stock replacement and high performance applications in 1984-' 91 Harley-Davidson® big twin models. This 3-1/2" (stock) bore crankcase o...

Perfect for stock replacement and high performance applications in 1984-' 91 Harley-Davidson® big twin models. This 3-5/8" bore crankcase offers so...

The S&S Super Stock alternator style crankcases are perfect for stock replacement and for high performance applications. Pre-clearanced for str...

The S&S Super Stock alternator style crankcases are perfect for stock replacement and for high performance applications. Pre-clearanced for str...

This Super Stock® T2 wrinkle black crankcases is for 2007-'16 HD® FL big twin engines with 4-1/8" bore and stock bolt pattern. Simple transmission ...

This Super Stock® T2 wrinkle black crankcases is for 2007-'16 HD® FL big twin engines with stock bore and stock bolt pattern. Simple transmission c...

Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI) Feature greater overall strength than stock crankcases Strong, dep...

S&S 93" big bore Hot Set Up Kit upgrades 74" and 80" shovel engines to 93" displacement at approximately 8.5:1 compression. The kit includes S&...

Solves the problem of oil carryover in Twin Cam "A" motors with stock oil pump Oil carryover is oil that comes out of your breather and all over y...

This stock bore, alternator style, wrinkle black crankcase is specially machined for the new S&S oil line installation kit for 2006-2017 Harley...

This 4 1/8" bore wrinkle black crankcase is specially machined for the new S&S oil line installation kit for 2006-2017 Harley-Davidson® Dyna® m...

This 4-1/8" wrinkle black, stock stud pattern crankcase for 1999–'06 HD® Twin Cam 88®A engines (except 2006 HD® Dyna®) is much stronger than stock ...

This 4-3/8" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels in 2003-'06 HD® internally balanced big twin engines, increasi...

This 4-5/8" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels in S&S® T124 T2 engines, and fits 2006 HD® Dyna models and...

This 4-5/8" stroke 8-1/2" diameter flywheel assembly fits 1999-'06 HD® big twin engines (except Dyna models) and S&S® T124 engines. May be used...

This 4-3/8" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels 2007-'16 HD® big twin engines, when using high performance pis...