SKU: HLY241-279
UPC: 090127003916
MPN: 241-279
These Holley fabricated aluminum valve covers are built for big block Chevy engines, covering the 396, 402, 427, and 454 displacements. They give a builder the welded sheet-aluminum look that wears well on a show motor while still working hard on a street or strip combination. The covers ship as a pair with mounting hardware included, so a builder can drop them onto a fresh top end without chasing extra parts. They carry laser-etched Chevrolet script and Bow Tie emblems, and the black satin finish keeps the presentation clean under the hood. See the rest of our engine parts for matching dress-up pieces.
Construction starts with 6061 T5 sheet aluminum, precision welded so the panels meet square and the covers seal flat. The standout feature is the thick one-piece quarter-inch billet aluminum gasket flange, which resists the warping that plagues thin stamped covers and holds a gasket without leaks across heat cycles. Pre-punched breather openings come fitted with internal baffles to keep oil out of the breather under hard running, and the 0.125-inch hole supports a positive crankcase ventilation setup. The perimeter-bolt, tall-height design clears most aftermarket roller rocker arms. The black satin coated finish carries the laser-etched Chevrolet and Bow Tie logos. Pair these with a matching big block Chevy oil pan and a fresh set of valve springs during a top-end refresh.
A builder reaches for these covers when a big block Chevy needs both clearance for tall valvetrain hardware and a finished look in the engine bay. They suit street rods, restomods, and weekend bracket cars where the motor stays on display. Note the emissions classification: these are legal for sale and use on uncontrolled, non-emissions-controlled vehicles, including 1967 and older U.S. manufactured federally certified vehicles. If you're assembling a complete top end, browse our valve cover hardware and oiling parts to round out the build before the covers go on.
They fit big block Chevy engines, covering the 396, 402, 427, and 454 cubic inch displacements. The perimeter-bolt mounting pattern matches standard big block Chevy heads, and the tall height adds clearance for taller aftermarket valvetrain hardware such as roller rocker arms.
They are sold as a pair, and mounting hardware is included in the box. A builder can install both covers on a fresh top end without sourcing additional bolts.
The 0.125-inch hole supports a positive crankcase ventilation fitting. The covers also include pre-punched breather openings fitted with internal baffles that help keep oil out of the breather during hard running.
They are welded from 6061 T5 sheet aluminum and use a thick one-piece quarter-inch billet aluminum gasket flange. That heavy flange resists warping and helps the gasket seal flat through repeated heat cycles, unlike thin stamped covers.
They are classified for sale and use on uncontrolled, non-emissions-controlled vehicles, including 1967 and older U.S. manufactured federally certified vehicles and older. Check your local vehicle requirements before installing on a newer emissions-controlled application.
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