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 complete 136 cubic inch crate engine engineered for 2018-2024 Harley-Davidson Milwaukee-Eight Softail models. Built on robust MKB-series crankcases, it features high-flow cylinder heads and premium valvetrain components, ready to bolt into your M8 Softail frame.
Why riders pick this
- 136 cubic inch displacement for ultimate power
- High-flow cylinder heads and premium valvetrain
- Direct bolt-in replacement for M8 Softails
- Oversized valves for improved engine breathing
- High-strength alloy cylinder head casting
Unleash the full potential of your Milwaukee-Eight Softail with the S&S Cycle MK136B crate engine. This 136 cubic inch powerhouse is designed as a direct bolt-in replacement, offering maximum displacement and enhanced reliability right out of the box. Every component is chosen for performance, from the high-strength alloy cylinder head castings to the precisely machined valvetrain.
Uncompromising Performance
- Commanding 136 cubic inches of displacement
- High-flow cylinder heads with premium seats and guides
- Oversized intake and exhaust valves for superior airflow
- Valve springs optimized for high lift cam profiles
- Billet aluminum covers for strength and a custom appearance
Engineered for Power and Reliability
The MK136B is more than just a big engine; it's a meticulously crafted performance upgrade. With its robust MKB-series crankcases and attention to detail in every component, this crate engine provides a solid foundation for riders seeking significant power gains. It’s designed to deliver consistent, reliable performance for your 2018-2024 M8 Softail.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 310-1296
- Displacement: 136 cubic inches
- Category: Engine Components / Engines
- Weight: 135 lb
Common questions
Will this engine fit my specific Softail model?
Yes, this S&S Cycle MK136B engine is designed to fit all 2018-2024 Harley-Davidson Softail models as a direct Milwaukee-Eight engine swap. It's a bolt-in upgrade for compatible models.
What is included with the S&S MK136B crate engine?
The crate engine includes a complete assembled unit with high-flow cylinder heads, premium valvetrain components, robust MKB-series crankcases, and a sprocket shaft spacer, ready for installation.
Does this engine require a special tune or ECU modifications?
Any engine upgrade of this magnitude will require a proper dyno tune and appropriate ECU calibration to ensure optimal performance, reliability, and to prevent potential engine damage. Consult a professional tuner.
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 | T14-887237 |
| WEIGHT | 135.0 lb |
