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 2006-2017 Harley-Davidson Dyna with S&S Cycle Crankcases, meticulously machined from 356-T6 aircraft-grade aluminum. These crankcases feature thicker wall sections for exceptional strength, making them ideal for both stock-bore replacement and high-performance custom engine builds. Experience the durability and precision S&S is known for.
Why riders pick this
- 356-T6 aircraft-grade aluminum construction
- Thicker wall sections for added strength
- Timken sprocket shaft bearing included
- Clearanced for large strokes and cam lifts
- Studs and cam bearings pre-installed
The S&S Cycle crankcase for 2006-2017 Harley Dyna models provides a superior foundation for any engine project. Its construction from premium aircraft-grade aluminum, combined with strategically thicker wall sections, ensures maximum durability and resistance to flex under extreme conditions. This robust design makes it perfectly suited for riders pushing the limits of their V-twin, offering peace of mind that your engine's core components can handle the power.
Engineered for Maximum Strength
- Constructed from high-grade 356-T6 aircraft-grade aluminum
- Thicker wall sections provide enhanced durability and rigidity
- Timken sprocket shaft bearing for reliable, heavy-duty performance
- Clearanced for strokes up to 4 13/16 inches and cams up to .720 inches lift
- Reinforced front motor mount for improved engine stability
- Studs and cam bearings are pre-installed for convenience
A Solid Core for Your Dyna Performance Build
This S&S crankcase is a critical upgrade for any 2006-2017 Dyna owner looking to build a powerful and reliable engine. It offers generous clearances for custom stroker and high-lift cam setups, giving you the flexibility to achieve your desired performance goals. The tough powder coat finish protects against the elements and maintains a clean aesthetic. Designed for compatibility with S&S oil line installation kits, this crankcase is ready to form the heart of your next serious V-twin project.
Specifications
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Brand: S&S Cycle
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Manufacturer Part #: 310-0878
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Category: Engine Components / Crankshafts
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Weight: 36.35 lb
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Bore Size: 4 1/8 in. and 4.425 in.
Common questions
Will this crankcase work with my custom stroker build?
Yes, this S&S Cycle crankcase is clearanced for strokes up to 4 13/16 inches and cams up to .720 inches lift, making it an excellent foundation for custom stroker engine builds on 2006-2017 Dyna models.
What is the bore size of this crankcase?
This S&S Cycle crankcase is available with 4 1/8 inch and 4.425 inch bore options, suitable for stock-bore replacement or custom high-performance applications on 2006-2017 Dyna models.
Are there any special installation requirements for this crankcase?
This crankcase is designed to be compatible with S&S oil line installation kits. As an internal engine component, professional installation by a qualified mechanic is highly recommended to ensure proper assembly and longevity.
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.
