Wiseco V-Twin Piston Kit - 1340 EVO BIG Twin 10:1 Comp — Harley-Davidson Electra Glide Classic, Softail Custom, Softail Heritage Classic (1984-1999)

Wiseco V-Twin piston kit for 1340cc EVO Big Twin engines, forged from high-silicon aluminum for strength and heat transfer. Direct fit for stock and rebored cylinders in cast iron, chrome, nikasil, and boron composite sleeves.

Features

• Forged high-silicon, low-expansion aluminum
• Diamond-turned finish with zero size variation
• Fits cast iron, chrome, nikasil, and boron composite cylinders
• Reduced weight and improved heat transfer
• Compatible with oversized and replacement cylinder sleeves

Specifications

• Brand: Wiseco
• Manufacturer Part #: K1668
• Compression Ratio: 10:1
• Engine Displacement: 1340cc EVO Big Twin
• Length: 9.6 in
• Width: 5 in
• Height: 4 in
• Weight: 2.5 lbs

Fitment

Fits Harley-Davidson 1340cc EVO Big Twin engines with 10:1 compression ratio. Compatible with stock bore and oversized applications in cast iron, chrome, nikasil, and boron composite cylinder configurations.

Frequently Asked Questions

Will this piston fit my Big Twin with a rebored cylinder?

Yes — Wiseco pistons are engineered to work in stock bore and oversized applications. Check your cylinder sleeve material before ordering to ensure compatibility.

What compression ratio is this kit?

This is a 10:1 compression ratio piston set, designed for performance and durability in stock and mildly modified EVO engines.

Can I use this in chrome or nikasil cylinders?

Yes — Wiseco pistons are designed to work confidently in cast iron, chrome, nikasil, and boron composite cylinders without special preparation.

Do these pistons require any special break-in procedure?

Follow standard break-in procedures for your engine — gradual throttle application and varied RPM for the first few hundred miles to properly seat the rings.

What's included in the kit?

The kit includes all pistons, pins, and circlips needed for a complete piston replacement in your 1340cc Big Twin engine.