Kb Pistons Forged Alloy Piston 10.5:1 .005 Oversized - Harley Evolution 80ci
About Kb Pistons
KB Performance Pistons builds hypereutectic and forged pistons for American V-twin engines, and is a long-standing choice for big-bore and stock-replacement rebuilds where budget and durability both matter.
Unleash the full potential of your Evolution 80ci engine with Kb Pistons forged alloy pistons. Designed for riders pushing the limits, these pistons deliver the durability and performance needed for high-output street or race applications.
Why riders pick this
- 4032 forged alloy construction for extreme durability
- Superior crack resistance under detonation and pre-ignition
- Optimized for high-compression street or race applications
- Includes rings, wrist pins, and wrist pin locks for complete assembly
- .005 oversized for precision engine rebuilding
When you're building an Evolution 80ci that's going to see serious power, stock pistons just won't cut it. Kb Pistons forged alloy pistons are engineered to stand up to the extreme pressures of detonation and pre-ignition, making them ideal for builds running power adders like NOS or turbo boost. This .005 oversized set with a 10.5:1 compression ratio is ready to transform your motor into a powerhouse.
Built for Boost and High Compression
- Constructed from 4032 forged alloy with 11% silicon content
- Engineered for superior crack resistance under extreme heat and pressure
- Designed for high-performance street or race builds with power adders
- Includes all necessary rings, wrist pins, and wrist pin locks
The Foundation for a Serious Build
Whether you're refreshing an EVO or chasing every last bit of power, these Kb Pistons provide a critical upgrade. Their robust construction ensures reliability when pushing higher compression ratios or introducing forced induction, giving you confidence on the street or the strip. Pair these with a performance cam and a proper dyno tune for a truly uncorked Evolution motor.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB921C.005
- UPC: 800745155368
- Bore Size: .005 oversized
- Compression Ratio: 10.5:1
- Engine: EVO 80ci
- Weight: 2.5 lbs per pair
- Country of Origin: Mexico
Common questions
What's included with this piston set?
Each set includes a pair of pistons, all necessary rings, wrist pins, and wrist pin locks, providing everything you need for installation.
Are these pistons suitable for boosted applications?
Yes, these pistons are specifically designed with superior crack resistance to handle the demands of power adders like NOS or turbo boost.
Do I need to bore my cylinders for these pistons?
These are .005 oversized pistons, so your cylinders will need to be bored and honed to the correct specification for proper fitment. Always confirm with your engine builder.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Kb Pistons |
| TYPE | Piston kits & Components |
| SKU | 824-01613 |
| WEIGHT | 2.5 lb |
