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

S&S Cycle Power Packs are forged piston sets engineered for Harley-Davidson engines to increase displacement and power output when paired with compatible cylinders. Built to OEM-spec tolerances for reliable performance in high-output engine builds.

Features

• Forged piston construction
• Increases engine displacement with compatible cylinders
• S&S Cycle engineering and quality control

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1389A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Designed for Harley-Davidson engines. Requires compatible cylinders and components to realize displacement and power gains. Verify fitment with your specific engine size and build plan before ordering.

Frequently Asked Questions

What cylinders do these pistons work with?

S&S Cycle Power Packs are engineered to work with compatible S&S and third-party cylinders. Consult S&S Cycle tech support to confirm compatibility with your specific build.

Do I need any other parts besides pistons and cylinders?

Yes — pistons alone require compatible cylinders, rings, and proper installation by a qualified engine builder. This is not a standalone upgrade.

What displacement increase can I expect?

Displacement gain depends on cylinder bore and stroke pairing. Consult S&S Cycle documentation for your specific piston and cylinder combination.

Are these forged pistons reliable for street riding?

Forged construction is built for high-output performance. Reliability depends on proper installation, tuning, and maintenance by a qualified builder.