131" kit for 99-17 Twin Cam S&S 4-1/4" bore 4-5/8" stroke w. 7.669" rods; 11.2:1cr (w/ 86cc heads); 10.6:1cr (w/ 95cc heads)

Aerospace-grade all-aluminum cylinder with nickel-silicon-carbide (NSC) electroplated bore

No sleeving allows for larger bore sizes

NSC-plated cylinders have less friction for increased horsepower, lower engine temperatures and a longer lifespan

Monster big bore kits will require case boring

Includes pair of all-aluminum NSC-coated bore cylinders, custom-forged pistons with high-tension rings specifically designed for NSC cylinders and a head/base gasket set

Replacement gasket sets available separately

Upgraded cylinders studs and head bolts recommended

Made in the U.S.A.

COLOR/FINISH GRANITE / HIGHLIGHTED FINS
BORE SIZE 4.250"
DISPLACEMENT 131"
STROKE LENGTH 4-5/8"