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

S&S Cycle Power Pack is a complete engine build kit combining 4.32-inch big bore cylinders with matched cam, cam plate, oil pump, and supporting components for reliable high-horsepower output on Harley-Davidson engines. Engineered as a bolt-together system to maximize performance without requiring extensive machine work.

Features

• 4.32-inch big bore cylinders
• Matched S&S cam and cam plate
• OEM-spec oil pump included
• Complete cam chest components
• High-flow design for peak horsepower

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1235D
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson engines. Confirm your specific engine platform (Evolution, Twin Cam, Milwaukee-Eight) with S&S before ordering to ensure correct kit version.

Frequently Asked Questions

What's included in the Power Pack?

Cylinders, pistons, cam, cam plate, oil pump, and cam chest components. Everything needed for installation on your engine block.

Do I need machine work to install this?

No — the Power Pack is designed as a bolt-together kit for direct installation onto a stock Harley engine block without boring or honing.

What horsepower increase can I expect?

Output depends on your starting engine platform, fuel tuning, and exhaust. S&S publishes dyno numbers by model year — contact them for specifics.

Is this street-legal?

Engine kits themselves are not restricted, but emissions compliance varies by state. Check local regulations before installing on a street bike.