✓ VERIFIED
Aug 28, 2023
Everything you expect from S&S
Have installed this kit on multiple bikes. S&S knows what they’re doing.
Image coming soon
S&S CYCLE
SKU: T14-1020359
S&S Cycle Power Packs High Compression Piston Set - Harley Big Twin & Sportster
$3,294.95
Free shipping on orders $99+ · Best value guarantee
affirm
From $274.57/mo with Affirm.
See if you prequalify
OUT OF STOCK
Free Shipping on orders $99+
Best Value Guarantee
30-Day Returns — see policy
Authorized Dealer — sourced direct
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.
Unleash more power from your Harley Big Twin or Sportster engine with S&S Cycle Power Packs. These precision-engineered piston sets are designed to increase displacement and compression, delivering a noticeable boost in horsepower and torque output.
Why riders pick this
- Boosts horsepower and torque output
- Increases engine displacement over stock
- Higher compression ratio for improved efficiency
- Direct bolt-in replacement for stock pistons
- S&S Cycle precision engineering
S&S Cycle Power Packs are direct bolt-in replacement piston sets, making them an ideal upgrade for both stock and modified Harley-Davidson engines. Experience a more responsive ride and enhanced performance across the RPM range.
Engineered for Performance
- Increased displacement over stock pistons for greater power potential
- Higher compression ratio to improve combustion efficiency
- S&S Cycle precision engineering ensures reliable performance
- Direct replacement fitment simplifies installation for a seamless upgrade
Upgrade Your V-Twin's Core
Whether you're refreshing an aging engine or chasing more usable power, these Power Packs lay the foundation for a stronger build. While they are a direct fit, proper engine assembly and tuning are critical to maximize the benefits of increased displacement and compression. Consult with a qualified engine builder to ensure optimal setup for your riding style.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 310-1057D
- Category: Engine Components / Piston Sets - Powersports
- Weight: 44.19 lb
Common questions
Will these pistons fit my stock Harley engine?
Power Packs are engineered as direct replacements for Harley Big Twin and Sportster platforms. Always confirm your engine year and displacement with Shop by Bike before purchase to ensure correct piston size and pin diameter for your build.
Do I need a complete engine rebuild to install these?
Piston installation requires engine disassembly and typically involves replacing rings and other related components. Professional engine assembly is recommended.
Will I need to retune my motorcycle after installing these?
Increasing displacement and compression will alter your engine's air/fuel requirements. A proper dyno tune is highly recommended to optimize performance and ensure engine longevity.
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 | T14-1020359 |
| WEIGHT | 44.19 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
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!
✓ VERIFIED
Mar 8, 2020
5 Stars
✓ VERIFIED
Jun 6, 2021
I didn't get it yet,can't wait too get it in my bike, than ill leave a review