Product Overview

Price for set of 2 covers
Includes mounting bolts
See Gaskets for Chevy Big Block valve covers to order gaskets for these valve covers.

By clicking ADD TO CART, you confirm that you checked fitment and acknowledge PML valve covers Finish and Construction is different from OEM.

Dimensions: Click here for dimensions.

Number of Bolts: 7 per cover, on the perimeter

Finishes: Read about finishes and construction of PML parts.

These tall heavy duty valve covers from PML for big block Chevy engines feature raised CADILLAC script and fins and top quality construction. The CADILLAC script is classic 1949 lettering, licensed from General Motors.

Benefits of these PML valve covers:

Classic 1949 CADILLAC script and sand cast construction for an old-school look and feel
PCV and oil fill/breather holes
Holes have internal baffles cast to reduce oil blow-by
Thick walls and gasket flanges for strength and a secure seal to the cylinder head

PML designed these valve covers using original GM cast iron heads. Chevrolet Big block engines include: 396, 427, 454, and the 502.

These valve covers are a bit taller than stock to fit over many roller rockers. Always verify clearance before ordering. Using double gaskets to add height frequently causes leaks. Customers have reported to us that PML tall valve covers eliminated the need for double gaskets and the leaks.

General Motors Trademarks are used under license to PML, Inc.

Applications:

PML designed these valve covers using original GM cast iron heads. Chevrolet Big block engines include: 396, 427, 454, and the 502.

These valve covers are taller than stock so check for space for larger valve covers.

Gaskets

Gaskets are not included with these valve covers. PML designed these Chevy Big Block valve covers to work with cork composite gaskets.

Breather and PCV Holes

PML Chevy big block valve covers have PCV and oil fill/breather holes and baffles cast into the covers. The internal baffles help prevent oil blow-by out the PCV and breather holes.

These holes work with standard 1 1/4 inch grommets.

If desired, a breather cap with a 1 inch outer diameter tube can be used with the breather grommet.

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Checking Clearance

Click for dimension. A separate window or tab will open.

Engine configurations vary so please check for clearance for larger valve covers. The walls and gasket flange are thicker than stock and the fins and script add height to the top.

Look for clearance on the inside also, especially if you have roller rockers. A simple check can be made if you have the stock valve cover. Set the stock cover on the head and measure the distance, if any, between the gasket flange surface and the head. This cover is approximately 3/8 to 1/2 inch taller than the stock cover. PML tall covers are approximately 3/8 inch taller than our standard height covers.

Some customers have reported that their roller rockers contact the inside of these PML valve covers at corners. PML has heard that grinding a bit off the roller rockers on #1 intake and #6 intake, one intake rocker on each side of engine, can add enough clearance (but this is not something we have tried or endorse).