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

S&S Cycle Power Packs are complete engine-build kits combining big-bore cylinders (4.32"), matched pistons, cam, cam plate, and oil pump to transform a stock Harley into a high-output street engine. Each kit ships ready to install with all internal components matched for reliable peak horsepower.

Features

• 4.32" big-bore cylinders
• Matched piston and ring set
• Cam, cam plate, and oil pump included
• All internal components pre-matched for reliability

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1225D
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson models. Verify specific year and engine family compatibility with S&S Cycle before ordering.

Frequently Asked Questions

What's included in the Power Pack?

Cylinders, pistons, rings, cam, cam plate, oil pump, and all matched internal components needed for installation into a compatible Harley engine.

Do I need a tuner with this kit?

Yes — a proper fuel map is essential after installing any big-bore kit to maintain drivability and reliability.

Will this fit my specific Harley?

Power Packs are engine-family specific. Contact S&S Cycle or your dealer with your year and model to confirm fitment before purchasing.

What kind of horsepower gain should I expect?

Output depends on your starting engine size and other modifications. S&S publishes dyno specs for each kit — check their website for your specific configuration.