Kb Pistons Forged Alloy Piston 10.5:1 .020 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.
Power up your Evolution 80ci engine with Kb Pistons forged alloy pistons. This .020 oversized set with a 10.5:1 compression ratio is built for riders pushing the limits, offering the strength and resilience needed for high-output street or race applications.
Why riders pick this
- 4032 forged alloy with 11% silicon content
- Superior crack resistance under detonation or pre-ignition
- Ideal for street and race applications with power adders
- Includes all rings, wrist pins, and wrist pin locks
- .020 oversized for engine rebuilds
For serious Evolution 80ci engine builds, especially those incorporating power adders, you need pistons that can handle the heat. Kb Pistons forged alloy pistons are crafted from 4032 forged alloy with 11% silicon content, providing exceptional crack resistance under the extreme conditions of detonation and pre-ignition. This makes them a prime choice for high-performance street and race setups running NOS or boost.
Uncompromising Strength for High Performance
- Forged 4032 alloy construction for superior strength
- Enhanced crack resistance against detonation and pre-ignition
- Fully machined for precise fitment and optimal performance
- Includes all rings, wrist pins, and wrist pin locks for a complete install
The Core of a Performance EVO Build
These .020 oversized pistons are the ideal foundation for an Evolution 80ci engine overhaul or a new high-performance build. Their robust design ensures reliability when running higher compression or forced induction, giving you peace of mind on the road or track. Combine these with a performance cylinder head and a custom dyno tune to truly unleash your V-twin's potential.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB921C.020
- UPC: 800745155382
- Compression Ratio: 10.5:1
- Overbore: .020
- Engine Size: EVO 80ci
- Weight: 2.75 lbs
- Country of Origin: Mexico
Common questions
What's included in this piston set?
This set includes a pair of forged pistons, all necessary rings, wrist pins, and wrist pin locks, providing everything required for assembly.
Can these pistons handle forced induction?
Yes, these pistons are specifically designed with superior crack resistance to perform reliably in applications utilizing power adders like NOS or turbo boost.
Do I need to modify my cylinders for these pistons?
As these are .020 oversized pistons, your cylinders will need to be bored and honed to the appropriate size for a precise and correct fitment.
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 | 824-01615 |
| WEIGHT | 2.75 lb |
