S&S Cycle · New
S&S Cycle 99-06 Twin Cam 88 A Engines 4-1/8in Bore S&S Stud Pattern Crankcase - Wrinkle Black
MPN 31-0178A · Store SKU ssc31-0178A
Supplier stock checked 11/8/2026, 7:27:17 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
This 4-1/8" wrinkle black S&S® 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 front motor mount for increased strength. The large cam chest allows cam lift up to .675" without clearancing, Timken® style sprocket shaft bearings withstand the most demanding applications. The S&S crankcase breather reed valve eliminates oil carry-over and oil scavenging problems. Clearanced for strokes up to 5". All passages between the crankcase and the cam support plate are o-ring sealed.
Manufacturer fitment & guides
Check 31-0178A against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
