S&S Cycle Power Packs — Harley-Davidson Electra Glide, Softail Heritage Classic, Electra Glide Classic (1955-2026)

S&S Cycle Power Packs are high-performance piston sets engineered for Harley-Davidson engines to increase displacement and horsepower. Direct replacement for stock pistons in compatible Harley models.

Features

• Increased engine displacement
• High-performance piston design
• S&S Cycle engineering
• Direct replacement installation

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1394A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson engines. Verify your specific model year and engine size with S&S Cycle fitment charts before ordering.

Frequently Asked Questions

How much horsepower will I gain?

Horsepower increase depends on your engine size, fuel tuning, and other modifications. S&S publishes dyno results by engine displacement on their website.

Do I need to re-tune my fuel system?

Yes — a new tune is required after installing larger displacement pistons to optimize air-fuel ratio and prevent detonation.

What models do these fit?

S&S Power Packs fit multiple Harley engine families. Check the fitment guide or contact S&S to confirm compatibility with your bike's year and model.

Is professional installation required?

Power packs require engine disassembly and honing. Professional installation by a qualified Harley technician is strongly recommended.