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

S&S Cycle Power Package combines big-bore cylinders (4.32"), forged pistons, a high-lift cam, cam plate, and oil pump in one kit designed to add reliable horsepower to Harley-Davidson engines. This matched-component approach saves money versus buying parts separately while ensuring cam timing and oil delivery work together.

Features

• 4.32-inch big-bore cylinders
• Matched high-lift cam and cam plate
• Forged piston set included
• Oil pump included
• Complete bolt-on kit

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1223D
• 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 before ordering.

Frequently Asked Questions

What's included in the Power Package?

Cylinders, pistons, rings, wrist pins, matched cam, cam plate, and oil pump — everything needed for a complete top-end rebuild.

Do I need to retune my fuel injection after installation?

Yes. A fuel and ignition tuning adjustment is required to optimize performance with the larger displacement and cam profile.

Will this fit my Harley engine?

Power Packages are engineered for specific Harley engine platforms (Twin Cam, Milwaukee-Eight, etc.). Confirm your engine type with the manufacturer before purchasing.

What horsepower increase can I expect?

Results depend on your engine platform, fuel tuning, and other modifications. Contact S&S Cycle for dyno numbers specific to your bike.