SH93 Vintage-Style EngineFits '70-'99 chassis with alternator-style primary S&S Super E carburetor S&S hydraulic valve train and roller rockers S&S electronic ignition Includes oil filter mount for generator location 3-5/8" bore x 4-1/2" stroke 8.5:1 compression ratio Natural crankcase with black powder-coat cylinders Made in the U.S.A. For '70-'99 custom chassis, with alternator style primary.