Wiseco Black Edition Piston Kit TC 103 CID 9.6:1 +.010 Oversize - Harley Twin Cam
About Wiseco
Wiseco has forged pistons in Mentor, Ohio since 1941, supplying everything from factory race teams to big-bore street builds. Forged construction is what lets a V-twin survive higher compression and more cylinder pressure than the stock cast piston was designed for.
The Wiseco Black Edition piston kit is specifically for Twin Cam 103 CID engines, featuring a 9.6:1 compression ratio and a +.010 oversized bore. Constructed from forged aluminum, this kit includes a premium ring package and dual thermal coatings for enhanced durability, superior oil control, and reduced friction in high-performance V-twin builds.
Why riders pick this
- Achieves 9.6:1 compression ratio with a +.010 oversize bore
- Forged aluminum construction for extreme strength
- Armor X and ArmorGlide coatings reduce wear and friction
- Premium ring package ensures superior oil control
- Compatible with OEM and Screamin' Eagle cylinder heads
- Designed for high-performance Twin Cam 103 builds
When your Twin Cam 103 is ready for a serious performance boost and requires a bore clean-up, the Wiseco Black Edition piston kit with a 9.6:1 compression ratio and +.010 oversize is the ideal solution. These forged aluminum pistons are built to withstand the rigors of high-performance riding, providing a significant increase in compression that translates directly into more power and torque. The advanced coatings and meticulous design ensure both longevity and optimal engine efficiency.
Built for High-Performance Demands
- Premium compression ring for an ultimate ring seal and maximum power
- Napier second ring with taper face and underhook for superior oil control
- 3mm oil ring design with higher tension for enhanced oil management
- Armor X piston coating significantly reduces wear under extreme conditions
- ArmorGlide skirt coating minimizes friction and improves scuff resistance for quieter operation
- Compatible with both OEM and Screamin' Eagle cylinder heads
The Core of a Powerful Build
This +.010 oversize kit is perfect for Twin Cam 103 engines undergoing a bore and hone, offering a fresh start with increased compression. The 9.6:1 ratio is a popular choice for riders seeking a noticeable power gain, especially when paired with an appropriate cam and a professional dyno tune. Invest in the foundation of your engine's performance with Wiseco's proven Black Edition pistons.
Specifications
- Brand: Wiseco
- Manufacturer Part #: K2791
- Engine Size: Twin Cam 103 CID
- Compression Ratio: 9.6:1
- Bore Size: +.010 oversized
- Length: 9 in
- Width: 4 in
- Height: 4 in
- Weight: 2.4 lbs
Common questions
What compression ratio does this piston give me?
This piston kit provides a 9.6:1 compression ratio. This is a higher compression ratio suitable for performance builds and will typically require a proper engine tune.
Why is the piston oversized?
The +.010 oversized bore is typically used when the cylinder requires machining to clean up the bore, allowing for a fresh, precise fit during a rebuild or performance upgrade.
Do I need a special tune for these pistons?
Yes, due to the increased compression ratio and oversized bore, a professional dyno tune is highly recommended to optimize your engine's performance and ensure proper fuel mapping and timing.
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 | Wiseco |
| TYPE | Black |
| SKU | K2791 |
| WEIGHT | 2.4 lb |
| 9.6 | 1 Compression |
