S&S Cycle Crankcases - Harley Milwaukee-Eight Touring
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.
These S&S Cycle crankcases are engineered for Harley-Davidson Milwaukee-Eight Touring engines, providing a robust foundation for serious performance upgrades. Designed to support larger bores and higher horsepower, they maintain a stock frame fitment for a straightforward installation. Riders looking to push the limits of their M8 will find these cases a critical upgrade.
Why riders pick this
- Supports larger bore sizes for displacement gains
- Improved oil scavenging for better engine health
- Enhanced structural rigidity for high horsepower
- Direct drop-in fit into stock Touring frames
When building a high-performance Milwaukee-Eight engine, the crankcases are the foundation. S&S Cycle has engineered these cases to handle the demands of increased displacement and horsepower, addressing common weak points found in OEM units. With improved oil scavenging and enhanced structural rigidity, these crankcases ensure your big-bore M8 build remains reliable and strong, mile after mile.
Built for Big-Bore Performance
- Engineered to support larger bore sizes for significant displacement increases
- Improved oil scavenging design ensures optimal lubrication under demanding conditions
- Enhanced structural rigidity provides a stable platform for high-horsepower applications
- Designed for a direct, drop-in fit into your stock Harley Touring frame
The Foundation of a Powerful M8
These S&S crankcases are an essential starting point for any rider planning a serious performance build on their Milwaukee-Eight Touring bike. They integrate seamlessly into the stock chassis, eliminating the need for complex modifications. Pair these with a high-performance S&S cam and cylinder kit to unleash the full potential of your M8 powerplant.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 310-1170
- Category: Engine Components / Crankshafts
- Weight: 41.4 lb
Common questions
Will these crankcases fit my stock Touring frame?
Yes, S&S designed these Milwaukee-Eight crankcases for a direct, drop-in fit into your stock Harley-Davidson Touring chassis without requiring frame modifications.
Are these cases suitable for a big-bore build?
Absolutely. These crankcases are specifically engineered to support larger bore sizes, making them an ideal foundation for increasing the displacement and power of your M8 engine.
Do these crankcases come with a crankshaft?
No, this product includes the crankcases only. You will need to source a compatible crankshaft separately, or reuse your existing one if it's in good condition.
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 | T14-666660 |
| WEIGHT | 41.4 lb |
