S&S Cycle Power Package 4.32" Big-Bore Kit - Harley V-Twin
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 Power Package is a comprehensive engine building kit designed to significantly boost the performance of your Harley. It combines big-bore 4.32" cylinders with a perfectly matched cam, cam plate, oil pump, and all necessary internals, making it ideal for high-performance V-twin builds.
Why riders pick this
- 4.32" big-bore cylinders included
- Matched high-performance cam and cam plate
- Complete oil pump and internal components
- Comprehensive cam chest package
- Designed for significant horsepower gains
This Power Package from S&S Cycle is engineered to deliver reliable horsepower gains without the hassle and expense of sourcing individual components. Every part within the kit is selected and matched by S&S, ensuring optimal compatibility and performance. It's a strategic investment for riders and builders looking to transform a stock Harley engine into a high-output powerhouse, all while maintaining the legendary S&S reputation for quality and durability.
Complete Performance Upgrade
- Features 4.32" big-bore cylinders for increased displacement
- Includes a matched high-performance cam and cam plate
- Comes with a high-flow oil pump and all necessary internals
- A complete cam chest package designed for optimal synergy
- Delivers significant and reliable horsepower gains
Building a High-Output Harley
The S&S Cycle Power Package is more than just a collection of parts; it's a foundation for serious performance. While it provides a complete solution for increasing displacement and power, professional assembly and a custom dyno tune are essential to unlock its full potential and ensure long-term reliability. This kit is for the rider who demands maximum performance from their Harley Touring, Softail, or Dyna, providing everything needed for a robust engine build.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 310-1238D
- Category: Engine Components / Piston Sets - Powersports
- Weight: 44.19 lb
Common questions
What engine displacement does this Power Package fit?
S&S Cycle offers Power Packages for various Harley engines. You must verify your specific engine year and displacement to ensure it matches this part number before purchase. Consult the 'Shop by Bike' tool for fitment.
Does this kit require additional machine work or is it a bolt-on part?
This S&S Cycle Power Package is a performance engine kit that requires professional assembly and tuning. It is not a bolt-on part and typically involves case boring and other machine work for proper installation.
Do I need a custom tune after installing this kit?
Absolutely. Any significant engine modification like a big-bore kit requires a professional dyno tune to optimize fuel mapping, ignition timing, and ensure the engine performs reliably and efficiently.
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 | Piston Sets - Powersports |
| SKU | T14-1020319 |
| WEIGHT | 44.19 lb |