Xtreme Series Valve Cover System - Raw 

Xtreme Series Valve Cover System, 1 Billet Oil Plug, 2 Breather Extensions and Filtered Breathers Included (pair)

Included:
• (1) Xtreme Series Valve Covers 620-44051
• (2) Breather Extension 620-154022
• (2) 1-1/2" Clamp-On Valve Cover Breather 620-70153
• (1) Bolt Kit 620-44005

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.

These use valve covers that are raw/unpolished.