109″ Evolution Big Twin Monster Big Bore Kit – Natural

– Fits 1984-2000 Evolution Big Twin Motorcycles with 4 5/8″ crankshaft. – 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. Additional upgraded services recommended. – Includes pair of all-aluminum NSC-coated bore cylinders, custom-forged pistons with high-tension rings specifically designed for SNC cylinders and a head/base gasket set. – Replacement gasket sets available separately – Upgraded cylinder studs and head bolts recommended. – Made in the U.S.A.