S&S CYCLE SKU: T14-1020384

S&S Cycle Power Pack Forged Piston Set - Harley-Davidson Engines

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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.

S&S Cycle Power Packs are forged piston sets engineered for Harley-Davidson engines to increase displacement and power output. These pistons are built to OEM-spec tolerances, ensuring reliable performance in high-output engine builds when paired with compatible cylinders.

Why riders pick this

  • Forged piston construction for superior strength
  • Increases engine displacement with compatible cylinders
  • Built to OEM-spec tolerances for reliable performance
  • Ideal for high-output Harley-Davidson engine builds
  • S&S Cycle engineering and quality control

When building a high-performance Harley-Davidson engine, the foundation matters. S&S Cycle Power Pack forged piston sets are designed to deliver the strength and precision required for increased displacement and significant power gains. These pistons are not just replacements; they are critical components for riders pushing their V-twin to its limits.

Built for Demanding Builds

  • Forged piston construction for extreme durability under stress
  • Increases engine displacement when used with compatible cylinders
  • S&S Cycle engineering ensures quality control and precise fitment
  • Designed for reliable performance in high-output engine builds

The Core of Your Power Upgrade

These S&S Cycle Power Pack pistons are the starting point for a serious engine upgrade. They are intended to be paired with compatible cylinders and other components to realize their full potential for displacement and power gains. For any performance build, verifying fitment with your specific engine size and build plan is essential to ensure optimal results and long-term reliability.

Specifications

  • Brand: S&S Cycle
  • Manufacturer Part #: 310-1389A
  • Category: Engine Components / Piston Sets - Powersports
  • Weight: 44.19 lb

Common questions

What cylinders do these pistons work with?

S&S Cycle Power Packs are engineered to work with compatible S&S and third-party cylinders. We recommend consulting S&S Cycle tech support to confirm compatibility with your specific build plan.

Do I need any other parts besides pistons and cylinders?

Yes, pistons alone require compatible cylinders to achieve displacement and power gains. A complete engine build typically involves other components such as cams, lifters, and a proper tune.

Will these pistons fit my specific Harley-Davidson engine?

These pistons are designed for Harley-Davidson engines. However, you must verify fitment with your specific engine size and build plan before ordering to ensure proper compatibility and performance.

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.
BRANDS&S Cycle
TYPEPiston Sets - Powersports
SKUT14-1020384
WEIGHT44.19 lb
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
5
4 RATINGS
5★ 4
4★ 0
3★ 0
2★ 0
1★ 0
✓ VERIFIED
Aug 28, 2023

Everything you expect from S&S

Have installed this kit on multiple bikes. S&S knows what they’re doing.

— BRETT M
✓ VERIFIED
Apr 13, 2022

100 kit is sick! 10/5/1 compression is perfect for the 585 cams. Not going to burn the tires unless you bounce it, but at 2.7 K it pulls like a freight train. Super fun! Thanks S&S!

— Anonymous
✓ VERIFIED
Mar 8, 2020

5 Stars

— Anonymous
✓ VERIFIED
Jun 6, 2021

I didn't get it yet,can't wait too get it in my bike, than ill leave a review

— Anonymous