S&S 7.5:1 88 Top End Kit For Harley Shovelhead Designed for Shovelhead engine rebuilds, this S&S Cycle Top End Kit provides the cylinders and pistons needed for an 88 setup with a 7.5:1 compression ratio. Features Includes cylinders and pistons-fit and ready to install with head and base gaskets Also includes base nuts and head bolts Stock cases and heads must be bored to accept the larger 3-5/8 bore cylinders Stock flywheels must be re-balanced S&S manifold must me purchased due to the increased cylinder length 4-1/4 stroke