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 and ring sets designed to increase displacement and horsepower in Harley-Davidson engines. Each pack includes pistons, rings, and pins ready for engine assembly in stock or modified cases.

Features

• S&S Cycle forged pistons
• Includes piston rings and pins
• Increases engine displacement
• Harley-Davidson engine specific

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1388A
• Weight: 44.19 lb
• Category: Engine Components / Piston Sets - Powersports

Fitment

Fits Harley-Davidson engines. Verify specific displacement and bore size compatibility with your engine before ordering.

Frequently Asked Questions

What's included in a Power Pack?

Forged pistons, piston rings, and wrist pins — everything needed for piston installation in your engine.

How much displacement increase can I expect?

Displacement gain depends on bore size and your engine's current displacement. Check S&S documentation for your specific engine application.

Do I need to machine my engine cases for these pistons?

It depends on your current piston size and target bore. Have your engine builder measure and confirm fitment before purchase.

Can these pistons be used in stock engine cases?

Yes, Power Packs can be installed in stock cases, but verify that your case can safely handle the increased displacement and compression.