Kb Pistons Forged Alloy Piston - Pistons EVO 80ci 9.5:1 STD — Harley-Davidson (1984-1999)

KB Pistons forged alloy pistons for Harley EVO 80ci engines at 9.5:1 compression ratio, machined from 4032 forged alloy with 11% silicon content. Built to resist cracking under detonation and pre-ignition, making them ideal for street or race engines running power adders like NOS or supercharger boost.

Features

• 4032 forged alloy with 11% silicon content
• Superior crack resistance under detonation
• Coated skirts on Twin Cam and Sportster applications
• All rings, wrist pins, and locks included
• Sold as a pair

Specifications

• Brand: KB Pistons
• Manufacturer Part #: KB920C.STD
• UPC: 800745155290
• Compression Ratio: 9.5:1
• Engine Size: 80 cubic inches (EVO)
• Weight: 3.14 lbs
• Country of Origin: Mexico

Fitment

Fits Harley EVO 80ci engines. Designed for street and race applications with power adders such as NOS or supercharger boost.

Frequently Asked Questions

What's included with the piston kit?

Pistons sold as a pair, plus all rings, wrist pins, and wrist pin locks needed for installation.

Why are these pistons better for boost and NOS?

The 4032 forged alloy with 11% silicon resists cracking under the extreme pressure and detonation of power-adder applications.

Do I need extra wrist pin locks?

Yes — each piston requires two wrist pin locks. Order 2 locks per piston (4 total for a pair).

Can I order replacement rings separately?

Replacement rings are available as a special order — contact the manufacturer for availability.