S&S Cycle MK136B 136 Cubic Inch Crate Engine - Harley Milwaukee-Eight Softail
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.
The S&S Cycle MK136B is a 136 cubic inch complete crate engine designed for 2018-2024 Harley-Davidson Milwaukee-Eight Softail models. This race-only engine is built on billet MKB-Series crankcases, featuring high-flow cylinder heads and premium valvetrain components for maximum performance.
Why riders pick this
- 136 cubic inch displacement for ultimate power
- High-flow cylinder heads with premium valvetrain
- Billet MKB-Series crankcases for superior strength
- Oversized valves enhance airflow and combustion
- Designed for race-only applications
When you're chasing every last bit of power for your M8 Softail, the S&S Cycle MK136B crate engine delivers. This complete, ready-to-install powerplant offers significant displacement and is constructed with top-tier components to handle the demands of competitive riding. It's engineered to be a direct replacement for your stock engine, transforming your bike into a true performance machine.
Engineered for Competition
- Massive 136 cubic inch displacement for unparalleled power
- High-flow cylinder heads with premium seats and guides
- Oversized intake and exhaust valves for improved airflow
- Heavy-duty valve springs to support aggressive cam profiles
- Billet aluminum covers for enhanced durability and a clean look
Built for the Track
This S&S Cycle crate engine is developed specifically for race applications. Its robust construction and performance-oriented design make it ideal for riders who push their bikes to the limit on the track. While it's not intended for street use, it provides the foundation for a dominant race setup, ready to bolt into your M8 Softail frame.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 310-1295
- Displacement: 136 cubic inches
- Weight: 135 lb
- Application: Race-only
Common questions
Will this engine fit my older Softail model?
No, this S&S Cycle MK136B engine is specifically designed for 2018-2024 Harley-Davidson Softail models with Milwaukee-Eight (M8) mounting points. It will not fit older Softail platforms.
Is this engine street legal?
No, this S&S Cycle MK136B crate engine is rated for race-only use and is not intended for street application. It is designed for closed-course competition.
What's included in the crate engine package?
The MK136B is a complete assembled crate engine, featuring billet MKB-series crankcases, high-flow cylinder heads, premium valvetrain components, and a sprocket shaft spacer, ready for installation.
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 | Engines |
| SKU | T14-887236 |
| WEIGHT | 135.0 lb |
