Keith Black Pistons KB909C.010 +.010" Dome Top Pistons w/10.5:1 Compression Ratio for Twin Cam 07-Up w/103ci Engine Big Bore 96ci to 103ci Conv

* Bore = 3.885in.

* Stroke = 4.375in.

* Forged 4032 Alloy is an 11% silicon alloy that is formed in a forging press then fully machined.

* Best resistance to cracking in hi-comp performance applications.

* Require .001in. wider piston to wall clearance.

* Anti-Friction skirt coating.

* 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.