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 forged piston kit for 1340cc EVO Big Twin engines with 10:1 compression ratio. High-silicon aluminum construction delivers strength and heat transfer for reliable performance across cast iron, chrome, nikasil, and boron composite cylinder bores.

Features

• High-silicon, low-expansion forged aluminum
• Diamond-turned finish from CNC precision machining
• Compatible with cast iron, chrome, nikasil, and boron composite cylinders
• Reduced weight and improved heat dissipation
• Oversized options available for rebored or sleeved cylinders

Specifications

• Brand: Wiseco
• Manufacturer Part #: K1666
• Compression Ratio: 10:1
• Engine: 1340cc EVO Big Twin
• Weight: 2.8752 lbs

Fitment

Fits Harley-Davidson 1340cc EVO Big Twin engines with standard and oversized bore specifications.

Frequently Asked Questions

Will this piston kit work in my chrome or nikasil cylinders?

Yes — Wiseco pistons are engineered to perform reliably in cast iron, chrome, nikasil, and boron composite cylinder bores without modification.

Can I use oversized Wiseco pistons if my cylinders are bored out?

Yes. Wiseco offers oversize options for rebored cast iron cylinders and for resleeved chrome, nikasil, and boron composite cylinders.

What compression ratio is this kit?

This kit is 10:1 compression ratio, suitable for stock and mildly modified 1340 EVO engines.

Is installation a DIY job, or do I need a shop?

Piston installation requires engine disassembly, machine work, and precise ring gap setting — professional machine shop installation is recommended.