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

S&S Cycle Power Packs are high-performance piston sets engineered for Harley-Davidson engines. These OEM-quality components deliver increased displacement and power gains when installed as part of a complete engine build or top-end refresh.

Features

• S&S Cycle engineering and manufacturing
• Direct Harley-Davidson fitment
• Engine component-grade piston set

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1399A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson engines. Consult S&S Cycle's fitment chart or contact support to confirm compatibility with your specific engine displacement and model year.

Frequently Asked Questions

What displacement increase will these pistons give my engine?

Displacement gains depend on the bore size and your original engine. Refer to S&S Cycle's specifications for your exact engine model.

Do I need a complete engine rebuild to install these?

Power Packs are typically installed as part of a top-end refresh or full engine build. Have a qualified mechanic assess your engine before ordering.

Are these pistons street-legal?

S&S Cycle manufactures to OEM standards. Verify with your local regulations, as engine modifications may affect emissions compliance.

What's included in the Power Pack?

The piston set; confirm whether rings, wrist pins, and gaskets are included or need to be ordered separately.