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Chevrolet® 396, 427, 454, & 502 Big Block With Raised CADILLAC® Script, Tall
Valve Covers

P/N 11134

PML Big Block Chevy Tall Valve Covers, Cadillac script, cast finishPML GM Licensing Stamp
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PML Big Block Chevy Valve Tall Covers, Cadillac, Black Powder CoatedPML GM Licensing Stamp
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PML Big Block Chevy Valve Tall Covers, PolishedPML GM Licensing Stamp
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As-cast finish
$325.00 (set of 2)
Go To Cart
Black powder coating
$450.00 (set of 2)
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Polished finish
$505.00 (set of 2)
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Dimensions: Click here for dimensions.

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.

These valve covers have PCV and oil fill/breather holes and baffles cast into the covers. The internal baffles prevent oil blow-by out the PCV or breather holes. PML valve covers have walls and gasket flanges that are thick for strength and a secure seal to the cylinder head. The sand cast finish process provides an old-school look and feel.

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, such as Jesel. 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.

Checking Clearance

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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. Our 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).


For pictures and information on all PML big block engine valve covers, please click to view PML Big Block Valve Covers PDF Flyer. A separate window will open and load the pdf file.

PML Valve Covers Compared to Stock

PML Valve Covers Part Number 11134 height compared to stock  PML Valve Covers Part Number 11134, compared to stock
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These images show a PML valve cover compared to the stock cover. The outside dimensions are shown. The distance to the gasket surface maybe different. See the link below the "Buy Now" button for more information on dimensions.

PML Valve Cover Features

  • Strong sand-cast aluminum construction
  • Thick side walls and gasket flanges that will not bend when bolts are tightened
  • Cast-in internal baffles
  • Mounting hardware included

For a larger picture, please click one of the above images. A separate window will open showing a bigger picture. (The larger pictures take a minute to display.)

Learn more about finishes and construction of PML parts.

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