Kb Pistons Super Duty 10:1 Big Bore STD Pistons - Harley Twin Cam & M8
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.
Take your V-twin to the next level with Kb Pistons Super Duty pistons. Designed for big bore conversions from 96ci up to 117ci, these pistons deliver a 10:1 compression ratio for significant power increases. Each set includes premium rings, wrist pins, and locks, ready for installation.
Why riders pick this
- Designed for Twin Cam 96/103 to 117ci big bore conversions
- Compatible with Milwaukee-Eight engine builds
- 10:1 compression ratio for significant power gains
- Line2Line Abradable skirt coating for reduced friction
- Includes premium Hastings rings, wrist pins, and locks
- Forced wrist pin oiling for enhanced component life
For riders pushing their Twin Cam or Milwaukee-Eight engines to higher displacements, the Kb Pistons Super Duty line offers the robust internals required. This piston set is engineered for big bore builds, taking your 96ci or 103ci Twin Cam to 117 cubic inches. The 10:1 compression ratio is a proven performer, laying the groundwork for substantial torque and horsepower gains.
Advanced Design for Extreme Performance
- Anodized top ring groove and crown enhance durability under high heat
- Line2Line Abradable skirt coating ensures optimal piston-to-cylinder clearance
- Premium Hastings steel nitride top ring and ductile Napier second ring for superior sealing
- Forced wrist pin oiling system provides crucial lubrication
- Flat-top design with valve pockets compatible with 1mm oversize valves
The Foundation for a Powerhouse Engine
These Super Duty pistons are an essential upgrade for any serious big bore Twin Cam or M8 project. Whether you're building a high-performance bagger or a custom V-twin, these pistons are designed to withstand the rigors of increased output. Ensure proper cylinder preparation and a professional dyno tune to maximize the benefits of this performance upgrade.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB662LCA.STD
- UPC: 800745248107
- Compression Ratio: 10:1
- Displacement Range: 96ci to 117ci big-bore
- Length: 6 in
- Width: 5 in
- Height: 5 in
- Weight: 2.5 lbs
- Country of Origin: Mexico
Common questions
Do these pistons fit both Twin Cam and Milwaukee-Eight engines?
Yes, these pistons are designed for big bore builds on both Twin Cam 96ci/103ci platforms up to 117ci, and are compatible with Milwaukee-Eight engine builds. Always verify your specific engine displacement and bore before ordering.
What is the compression ratio of these pistons?
These Kb Pistons Super Duty pistons feature a 10:1 compression ratio, ideal for performance builds seeking increased power and torque.
Are these pistons a direct bolt-in replacement?
These pistons are for big bore conversions, meaning your cylinders will likely require machining to achieve the proper displacement and fit. Consult a qualified engine builder for installation.
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 | 824-01820 |
| WEIGHT | 2.5 lb |
| 10 | 1 Compression |
