Xtreme Series Valve Covers, Polished with 3 Holes Machined 

Xtreme Series Valve Covers, Polished with 3 Holes Machined, 1 with a Oil Plug, 2 for Breather Installation (pair)

A number of companies have tried to copy this Hardin Marine cover by building sand cast copies. There's a difference if you look at their wavy, pin holed, porous covers you'll see that the Hardin Marine "XS" Xtreme cover is a beautiful die cast cover with no waves and no blemishes. So if you're looking for the best 1-piece cover this is it. This cover has been specially designed to fit marine Big Block Chevy engine with center rise exhaust. Angling one side of the cover helps to access the 2 lower center bolts while maintaining enough valve cover height to run roller rockers and stud girdles. One of the covers has a billet screw in -16 AN oil fill. Breathers sold separately.