131" | 124" | 117" Monster Big Bore Kits / Twin Cam

No Shipping to CA Fits 99-17 Twin Cam Motors 131 KITS FOR 99-17 TWIN CAM S&S 4 1/4 BORE; 4 5/8 STROKE W/7.669 RODS; 11.2:1cr (WITH 86cc HEADS); 10.6:1cr (WITH 95cc HEADS) 124 KITS FOR 99-17 TWIN CAM 4 1/4 BORE; 4 3/8 STROKE; 11.2:1cr (WITH 86cc HEADS); 10.4:1cr (WITH 95cc HEADS) 117 KITS FOR 99-17 TWIN CAM 4 1/8 BORE; 4 3/8 STROKE; 10.5:1cr (WITH 86cc HEADS); 9.8:1cr DISHED PISTONS (WITH 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 USA