S&S Cycle Power Packs — Harley-Davidson

S&S Cycle Power Packs combine big-bore cylinders (4.32") with matched pistons, cam, cam plate, and oil pump to build reliable horsepower without a full custom engine build. Designed as a complete bolt-together kit for Harley-Davidson riders seeking performance gains at a reasonable price point.

Features

• 4.32" big-bore cylinders
• Matched piston and cam package
• Includes cam plate and oil pump
• Complete power-adder kit

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1224D
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

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

Frequently Asked Questions

What's included in a Power Pack?

Cylinders, pistons, cam, cam plate, and oil pump — everything you need for the cam chest and top end.

Do I need to machine my cases?

Power Packs are designed for bolt-together installation, but have your cases checked by a machine shop to confirm they're ready for the bore size.

Will this kit fit my Harley?

Power Packs fit most Harley-Davidson models, but engine size and year matter. Contact S&S Cycle or your dealer to confirm fitment for your specific bike.

Does this require tuning?

Yes — a fuel map adjustment or ECU tune is strongly recommended to maximize horsepower and drivability with increased displacement and compression.