Kb Pistons Forged Alloy Piston - Pistons Tc96 TO 103ci 10.5:1 .010 — Harley-Davidson (2007-2017)

KB Pistons forged 4032 alloy piston for Twin Cam 96 to 103ci engines at 10.5:1 compression, sized .010 over. Built from 4032 forged alloy with 11% silicon content and fully machined for superior crack resistance under detonation and pre-ignition, making it ideal for street and race applications 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
• Includes rings, wrist pins, and wrist pin locks
• Sold as a pair

Specifications

• Brand: KB Pistons
• Manufacturer Part #: KB909C.010
• UPC: 800745152923
• Compression Ratio: 10.5:1
• Over Size: .010
• Engine Range: Twin Cam 96 to 103ci
• Weight: 2.6 lbs
• Country of Origin: Mexico

Fitment

Fits Twin Cam engines from 96ci to 103ci displacement at 10.5:1 compression, .010 oversized. Designed for street and race applications with power adders such as NOS or supercharger boost.

Frequently Asked Questions

What's included with these pistons?

The pair of pistons, rings, wrist pins, and wrist pin locks are all included. You will need 2 locks per piston.

Can I use these on a stock Twin Cam without power adders?

Yes — these pistons work in stock applications, but they are optimized for engines running NOS or boost where detonation resistance is critical.

Are replacement rings available?

Yes, replacement rings are available as a special order from KB Pistons.

Will these fit my 107ci or larger engine?

No — this part is sized for Twin Cam 96 to 103ci displacement. Larger engines require a different piston.

What does .010 over mean?

The piston diameter is .010 inches larger than stock, requiring your cylinders to be bored .010 over during rebuild.