EMI's valve covers are specifically designed to work on Big Block Chevy engines with center rise exhaust systems. The covers are extra tall to clear stud girdles and roller rockers. They are cast from high quality aluminum and machine finished across the face to insure a consistent surface for polishing. They are also available Fusioncoated by special order. Each set includes an oil fill hole and cap on 1 cover and stainless steel bolts and washers.