Keith Black Pistons KB411.STD Std Dome Top Pistons w/10.5:1 Compression Ratio for Twin Cam 99-06 w/Big Bore 88ci to 95ci Conversion

* Bore=3.875in.

* Stroke=4.000in.

* Hypereutectic Alloy is a cast 16% silicon content material

* Perfect for air cooled engines

* Low thermal expansion rate = tighter piston-to-cylinder clearance

* Complete kit includes: two pistons, rings, wrist pins and clips.

Tech Tips:-

* 10.5:1 Compression Ratio with 85cc Head Chamber Volume.

* Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers Instructions.

* Pull the engine down first & measure the existing bore to determine if oversize pistons are required PRIOR to purchase, we do not take back piston kits. The onus is on the assembling technician to validate the cylinders & required pistons.