Chevy Big Block Short Bolt Fabricated Aluminum Valve Covers with Breather Holes - Black

• Fabricated aluminum with 1/4 in. billet rail resists warping and improves gasket sealing

• Internal baffling reduces oil blow-by for cleaner crankcase ventilation

• Short-bolt pattern fits Chevy Big Block 396/402/427/454 (Gen II/Mark IV)

• Black finish that resists corrosion.

These valve covers are built for the Chevrolet Big Block Gen II (Mark IV) V8 family — 396, 402, 427, and 454 CID — as found in Chevelle, Camaro, Corvette, C10/C20 trucks, Impala, El Camino, and Monte Carlo applications using the short-bolt valve cover pattern.

Construction is fabricated aluminum with a 1/4 in. billet aluminum sealing rail, finished in clear anodize to resist corrosion while keeping the natural aluminum appearance visible. Internal baffling is built in to help control oil movement and reduce blow-by, and breather holes are provided for crankcase ventilation routing.

These covers use the short-bolt mounting pattern specifically — Big Block Chevy heads were produced in both short-bolt and long-bolt valve cover configurations, so confirming which pattern your cylinder heads use is a required step before ordering, not just before installation.

Gaskets, grommets, and mounting hardware are not included with this set, so these should be sourced separately to match your specific application.

Applications
Fits Chevrolet Big Block Gen II (Mark IV) V8 engines: 396, 402, 427, and 454 CID. Common platforms include Chevelle, Camaro, Corvette, C10/C20 trucks, Impala, El Camino, and Monte Carlo, specifically on cylinder heads using the short-bolt valve cover pattern.

Installation
Covers use a perimeter-bolt mounting style. Because gaskets, grommets, and hardware are not included, these need to be selected to match your gasket surface and existing breather/PCV setup. Confirm short-bolt vs. long-bolt head pattern, rocker arm clearance, and hood clearance before ordering.

Will these valve covers fit my Big Block Chevy?
These valve covers are designed for Chevrolet Gen II (Mark IV) Big Block V8 engines, including the 396, 402, 427, and 454 CID applications equipped with the short-bolt valve cover pattern. Verify that your cylinder heads use the short-bolt pattern before ordering, as they are not compatible with long-bolt cylinder heads.

What's the difference between short-bolt and long-bolt Big Block valve covers?
Chevrolet Gen II (Mark IV) Big Block cylinder heads were manufactured with two different valve cover bolt patterns: short-bolt and long-bolt. These valve covers are designed specifically for the short-bolt pattern and are not interchangeable with long-bolt applications.

Do these come with gaskets or mounting hardware?
No. Gaskets, grommets, and mounting hardware are not included and must be purchased separately to suit your specific application.

Are these valve covers baffled?
Yes. These valve covers feature internal baffling to help control oil movement inside the valve cover and reduce the amount of oil reaching the breather openings during engine operation.

What's the rail thickness and material?
These valve covers feature a 1/4-inch billet aluminum sealing rail designed to resist warping and provide a stable sealing surface for improved gasket retention.

Will these clear aftermarket rocker arms?
These are tall-profile valve covers that provide additional clearance compared to stock-height covers, making them suitable for many aftermarket roller rocker arm and performance valvetrain combinations. Verify clearance for your specific rocker arms and valvetrain components before installation.

Can these be used with a PCV system, or breather-only?
These valve covers include machined breather openings that can be configured for a PCV system, breathers, or a combination of both, depending on your engine setup. Verify that your chosen breathers, PCV valve, grommets, and port sizes are compatible with your intended crankcase ventilation system before installation.