Big Block Chevy Racing Laser Engraved 468 Logo Black Valve Covers Sold as a Pair Exterior: 4  9/16 Interior: 4  3/8 Common Engine Sizes These Covers Fit 396, 427, 454, 496, 502, 572, ZL1 Baffles Installed with Chrome Push Breathers Will Clear Roller Rockers and Stud Girdles )