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

S&S Cycle Power Packs are big-bore engine kits engineered to deliver serious horsepower gains without guesswork. Each kit pairs 4.32-inch cylinders with matched pistons, cam, cam plate, oil pump, and all necessary hardware for a complete, bolt-together top-end transformation.

Features

• 4.32-inch big-bore cylinders
• Matched piston and ring set
• Cam, cam plate, and oil pump included
• Complete bolt-together kit
• Designed for reliable high-performance output

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1229D
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson models. Verify engine displacement and year compatibility with S&S or your dealer before ordering, as Power Packs are tuned to specific engine platforms.

Frequently Asked Questions

What comes in the Power Pack?

Cylinders, pistons, rings, cam, cam plate, oil pump, and all gaskets and hardware needed for installation.

How much horsepower will I gain?

Gains depend on engine displacement, tune, and fuel. Expect 15–30+ hp over stock, subject to dyno verification.

Do I need to re-tune my bike after installation?

Yes. A fuel/air tune via ECU reprogram or carburetor adjustment is strongly recommended to maximize performance and reliability.

Is professional installation required?

Yes — Power Pack installation requires engine disassembly and expertise. Have a qualified Harley shop or engine builder perform the work.

Will this fit my specific Harley model?

Power Packs are made for specific Harley platforms. Confirm your engine type and year with S&S or an authorized dealer to ensure compatibility.