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

S&S Cycle Power Packs are complete piston and ring assemblies designed to increase displacement and compression in Harley-Davidson engines. These direct-fit replacements swap in place of stock pistons to deliver more power without major engine modifications.

Features

• Complete piston and ring assembly
• Increased displacement design
• Higher compression ratio
• S&S Cycle engineering
• Drop-in replacement for stock pistons

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1403A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson engines engineered for increased displacement and compression applications.

Frequently Asked Questions

What's included in the Power Pack?

Complete piston and ring assembly ready to install into compatible Harley engines.

Do I need to hone my cylinders before installing?

Check the S&S installation guide for your specific engine — cylinder prep may be required depending on current bore condition.

Will this increase my horsepower?

Yes — the increased displacement and compression ratio deliver measurable power gains over stock pistons.

Is machine work required to install these?

Installation requires engine teardown and proper assembly technique. Most riders use a professional engine builder for piston replacement.