Bottom End

S&S Cycle #31-0047 - Engine Case - +4.000" Bore - Special Application - Evolution Big Twin

Designed for high performance engines with cylinder bores between 4" and 4 3/8". Fits 1984–'99 big twins with 4" bore and over S&S 4 3/8" bore: V126 S&S 41/8" bore: V124, V111, V117 S&S 4" bore:...

S&S Cycle #31-0052 - Engine Case - Super Stock® - 3.500" - Evolution Big Twin

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank position sensor, they are also compatible with stock...

S&S Cycle #31-0055 - Engine Case - Super Stock® - 3.500" - Evolution Big Twin

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank position sensor, they are also compatible with stock...

S&S Cycle #31-0078 - Engine Case - Super Stock® Big Bore - 3.625" - Evolution Big Twin

Perfect for stock replacement and high performance applications, these crankcases offer some unique features. Besides being machined for a crank position sensor, they are also compatible with stock...

S&S Cycle #31-0172A - Engine Case - 3.750" Bore w/Stock Stud Pattern - 88A Engine Type - Wrinkle Black -Twin Cam

Not for '06 Dyna.Large cam chest allows cam lift up to 0.675" without clearancing.Includes S&S crankcase breather reed valve designed to eliminate oil carry-over and oil scavenging problems...

S&S Cycle #31-0181A - Engine Case - 4.125" Bore w/Stock Stud Pattern - 88A Engine Type - Wrinkle Black - Twin Cam

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 crankcases in every aspect. It has an extra large...

S&S Cycle #31-2096 - Breather Reed Valves - Crankcase - Standard - Evolution Big Twin '93-'99

Crankcase Breather Reed Valve for 1993-'99 bt. Available in standard size or +.030" for use in engines with damaged breather bores FitmentYear(s)MakeModel CodeModel1993-1999Harley-Davidson

S&S Cycle #31-2100 - Breather Reed Valves - Crankcase - +0.030" Oversize - Evolution Big Twin '93-'99

Breather Reed Valves - Crankcase - +0.030" Oversize - Evolution Big Twin '93-'99FeaturesNew-style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, reeds...

S&S Cycle #31-4011 - Sprocket Spacer - Big Twin

Fatigue proof drive sprocket spacer for 1965-1999 big twin. Replaces OEM p/n 24002-70. FitmentYear(s)MakeModel CodeModel1965-2028Harley-Davidson—Big Twin

S&S Cycle #310-0367A - Engine Case - 3.750" Bore w/Stock Stud Pattern - Wrinkle Black - Twin Cam

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 case modificiations is required. Features &...

S&S Cycle #310-0742 - Breather Valve - Crankcase - A Motor - Twin Cam '03-'06

Breather Valve - Crankcase - A Motor - Twin Cam '03-'06FeaturesSolves the problem of oil carryover in Twin Cam "A" motors with stock oil pumpOil carryover is oil that comes out of your breather and...

S&S Cycle #310-0810 - Cam Chest with Plate Kit - 509G - Standard Cams - Twin Cam

For '99-'06 Twin Cam, except '06 Dyna.FeaturesUpgrade to S&S bolt-in performance camshaftsImproves engine performance - higher lift and optimized cam timingS&S Quickee pushrods - easy installation,...

S&S Cycle #310-0811 - Cam Chest with Plate Kit - 510G - Standard Cams - Twin Cam

For '99-'06 Twin Cam, except '06 Dyna.FeaturesUpgrade to S&S bolt-in performance camshaftsImproves engine performance - higher lift and optimized cam timingS&S Quickee pushrods - easy installation,...

S&S Cycle #310-0812 - Cam Chest with Plate Kit - 551GE - Easy Start Cams - Twin Cam

For '99-'06 Twin Cam, except '06 Dyna.Require the use of high lift valve springs (sold separately).Not recommended with compression ratio of 10.0:1 or higher.FeaturesUpgrade to S&S bolt-in...

S&S Cycle #310-0870 - Motor Install Kit - Black - FXD

The new S&S oil line kit includes a special transmission oil pan and stainless steel hard lines that make hook-up Features & Benefitsstraight forward and attractive. Allows the installation of a...