Kb Pistons Forged Alloy Piston 10.5:1 .010 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.
Maximize the power and durability of your Evolution 80ci engine with Kb Pistons forged alloy pistons. This .010 oversized set is crafted for riders who demand robust performance in high-output street or race applications, especially when running power adders.
Why riders pick this
- Forged 4032 alloy for superior strength and heat resistance
- Enhanced crack resistance for boosted or high-compression engines
- Complete kit with rings, wrist pins, and locks included
- Optimized for high-output street and race applications
- .010 oversized for precise cylinder boring
Building a high-performance Evolution 80ci requires components that can withstand extreme conditions. Kb Pistons forged alloy pistons are engineered from 4032 forged alloy with 11% silicon content, delivering superior crack resistance under the stresses of detonation and pre-ignition. This makes them an ideal choice for serious street machines or race bikes running NOS or turbo boost.
Engineered for Extreme Conditions
- Forged 4032 alloy with 11% silicon for enhanced durability
- Designed to resist cracking under detonation and pre-ignition
- Ideal for high-compression, high-performance builds
- Includes all piston rings, wrist pins, and wrist pin locks
The Heart of a High-Performance EVO
These .010 oversized pistons provide the foundation for a reliable, high-horsepower Evolution build. Their fully machined construction ensures consistent performance and fitment, crucial for engines operating at their peak. Combine these pistons with a performance cylinder head package and a precise tune to unlock the full potential of your Harley-Davidson V-twin.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB921C.010
- UPC: 800745155375
- Compression Ratio: 10.5:1
- Bore Size: .010 oversized
- Engine: EVO 80ci
- Length: 9.4 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 2.75 lbs
- Country of Origin: Mexico
Common questions
What is included with this piston set?
This set comes complete with a pair of pistons, all necessary piston rings, wrist pins, and wrist pin locks, ready for assembly.
Are these pistons designed for power adders?
Yes, the 4032 forged alloy construction provides superior crack resistance, making these pistons well-suited for applications using power adders like NOS or turbo boost.
Will these fit my stock Evolution cylinders?
These are .010 oversized pistons, which means your cylinders will require boring and honing to the correct dimensions for proper installation and optimal performance.
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 | 824-01614 |
| WEIGHT | 2.75 lb |
