Kb Pistons Forged Alloy Piston - Pistons EVO 80ci 9.5:1 .020 — Harley-Davidson (1984-1999)

KB Pistons forged alloy piston for Harley EVO 80ci engines with 9.5:1 compression ratio and .020 oversized bore. Made from 4032 forged alloy with 11% silicon content, these pistons deliver superior crack resistance under detonation and pre-ignition, making them ideal for street or race motors running power adders like NOS or boost.

Features

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

Specifications

• Brand: KB Pistons
• Manufacturer Part #: KB920C.020
• UPC: 800745155320
• Compression Ratio: 9.5:1
• Bore Size: .020 over
• Engine: EVO 80ci
• Length: 9.6 in
• Width: 4.8 in
• Height: 4.6 in
• Weight: 2.8 lbs
• Country of Origin: Mexico

Fitment

Designed for EVO 80ci engines in street or race applications with power adders such as NOS or boost.

Frequently Asked Questions

What's included in this piston kit?

One pair of pistons with all rings, wrist pins, and wrist pin locks included. You will receive 2 wrist pin locks per piston (4 total for the pair).

Do these pistons have coated skirts?

Yes — all Twin Cam and Sportster applications feature coated skirts to reduce friction and wear.

Can I use these pistons on a naturally aspirated EVO?

Yes, they will work on naturally aspirated engines, but they are engineered specifically for power adder applications like NOS or boost where detonation resistance is critical.

Are replacement rings available separately?

Yes, replacement rings are available as a special order through KB Pistons. Contact the manufacturer or dealer for ordering details.

What compression ratio do these pistons deliver?

These pistons are designed for a 9.5:1 compression ratio in an 80ci EVO engine.