<p>This is a new pair of Big block Chevy fabricated aluminum valve covers. Fits 1966-2000 big block Chevy 396, 402, 427, 454, and 502's. Tall style - 3 1/4", will clear almost all valve train combinations. These have the outer bolts going through the top of the covers for more valvetrain clearance. Includes valve cover bolts!</p><p>These are a fully TIG welded aluminum cover. Thick 1/4" billet rail. 1 1/4" baffled breather holes. Requires a 1-1/4" OD grommet.</p>