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

S&S Cycle Power Packs are premium piston sets for Harley-Davidson engines that increase displacement and horsepower compared to stock pistons. These are direct bolt-in replacements engineered for high-performance builds and stroker applications.

Features

• S&S Cycle engineering
• Engine displacement increase
• High-performance piston design
• Direct bolt-in replacement

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1397A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 44.19 lb

Fitment

Fits Harley-Davidson engines. Consult S&S documentation for specific model year and engine compatibility before ordering.

Frequently Asked Questions

What displacement increase will I see with these pistons?

Displacement gain depends on your engine's stroke and bore combination. Check S&S technical specs for your specific engine.

Do I need to get my engine bored or honed?

That depends on your engine's current bore size and which S&S piston set you order. Consult S&S sizing guides or your engine builder.

Are these pistons forged or cast?

S&S manufactures high-performance pistons for durability. Contact S&S directly for material specifications on this part number.

Will I need custom rings or wrist pins?

Check the S&S documentation included with your piston set. Compatibility depends on your engine's block and cylinder configuration.