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

S&S Cycle Power Packs are forged piston sets engineered for Harley-Davidson engines, delivering increased displacement and compression for measurable gains in power and torque. Drop-in upgrade for riders seeking more performance from stock or modified engine platforms.

Features

• S&S Cycle forged piston construction
• Increased displacement over stock
• Increased compression ratio
• Designed for Harley-Davidson applications

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1392A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson engines. Verify your specific engine displacement and model year with S&S Cycle before ordering to ensure correct piston size and pin diameter.

Frequently Asked Questions

Will these pistons fit my specific Harley engine?

S&S makes Power Packs for multiple Harley engine families (Evo, Twin Cam, Milwaukee-Eight, etc.). Confirm your engine type and displacement with S&S before purchase.

Do I need to have my engine bored or honed?

Installation typically requires machine shop work to hone cylinders to the proper piston size — do not attempt a self-install without proper equipment.

What power and torque gains should I expect?

Power gains depend on your engine displacement, compression increase, and fuel octane. Dyno testing after installation will show your actual gains.

Can I use these with my stock heads and intake?

Power Packs increase displacement and compression, so you may want to upgrade fuel system and ignition tuning to unlock full potential.