S&S Cycle Crankcases Wrinkle Black 4-1/8" - Harley Twin Cam 88A
About S&S Cycle
S&S Cycle has built American V-twin performance parts in Viola, Wisconsin since 1958 — flywheels, carburetors, cams, cylinder heads and complete crate engines. When a Harley owner talks about a 124, a 128 or a 131 build, they are usually talking about S&S. Few names carry more weight with engine builders in this space.
Upgrade your 1999–2006 Harley-Davidson Twin Cam 88A engine (excluding 2006 Dyna) with the robust S&S Cycle Crankcase. This 4-1/8" wrinkle-black case is engineered with reinforced features, providing a superior foundation for any high-performance V-twin build. It includes essential components like the breather reed valve, pinion shaft, and Timken bearings, ensuring a complete and solid upgrade.
Why riders pick this
- Reinforced 4-1/8" wrinkle-black case
- Oversized cam chest for high-lift cams
- Timken bearings for durability
- S&S breather reed valve included
- Direct installation with stock stud pattern
The S&S Cycle Crankcase is designed for Harley Twin Cam 88A owners looking to build a more powerful and durable engine. With an extra-large front motor mount and an oversized cam chest, this crankcase provides the structural integrity and clearance needed for aggressive cam profiles and increased output. The wrinkle-black finish not only looks sharp but also provides a durable coating, making it a performance-focused and visually appealing upgrade for your Harley.
Built for Strength and Performance
- Extra-large front motor mount for increased rigidity and strength
- Oversized cam chest clears up to .675" cam lift without modification
- Timken-style sprocket shaft bearings for enhanced durability in demanding applications
- S&S breather reed valve engineered to eliminate oil carry-over issues
- Stock stud pattern ensures direct installation with existing components
The Foundation for Serious Power
This S&S crankcase is the ideal starting point for a serious Twin Cam engine project. Its reinforced design and thoughtful engineering address common weak points in stock cases, allowing you to run higher compression and more aggressive cam timing with confidence. It comes ready to accept your existing cylinders and heads, making it a comprehensive solution for riders aiming for significant power gains and improved engine reliability. Always confirm compatibility with your specific year and model before purchase, especially for 2006 Dyna models which are not compatible.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 31-0181A
- Case Finish: Wrinkle black
- Case Size: 4-1/8 inch
- Weight: 33.2 lb
- Category: Engine Components / Crankshafts
Common questions
Is this crankcase compatible with 2006 Harley-Davidson Dyna models?
No, this S&S Cycle crankcase is specifically not compatible with 2006 Dyna models. It is designed for 1999–2006 Harley-Davidson Twin Cam 88A engines, excluding that specific Dyna year.
What is included with the S&S Cycle crankcase kit?
The kit includes the crankcase itself, a breather reed valve, pinion shaft, Timken bearings, and all necessary mounting hardware to facilitate installation.
Can I use high-lift camshafts with this crankcase?
Yes, this S&S Cycle crankcase features an oversized cam chest that allows for up to .675" cam lift without requiring additional clearancing, making it ideal for performance cam upgrades.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | S&S Cycle |
| TYPE | Crankshafts |
| SKU | T14-663806 |
| WEIGHT | 33.2 lb |
