KB Performance, 96" To 103" Big Bore Piston Set. +.040" For Harley Davidson

For 96" to 103" (3 3/4" to 3 7/8") big bore conversions.
Used with stock heads and cylinders.
By boring the stock cylinders from 3-3/4" to 3-7/8" big bore size engine capacity will increase from 96" to 103".
Comes with T5 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise.
10.0:1 CR with 85cc head.
Head type: Flat top. +1.9cc / Compression height 1.076". Bore 3.875" / Stroke 4.375". Rod length 7.667".
Note: Top compression ring will need additional clearance.
See instructions.

Fits: > 07-17 Twin Cam (NU)