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PML Valve Covers for Chevrolet® 396, 427, 454, & 502 Big Block Engines
Raised CADILLAC® Script and Fins, Tall

Part Number 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
$350.00 (set of 2)
Go To Cart
Black powder coating
$480.00 (set of 2)
Go To Cart
Polished finish
$550.00 (set of 2)
Go To Cart

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.

Benefits of these PML valve covers:

  • 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
  • Sand cast construction for 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. 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.

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.

PML big block valve cover with breather installed Close up view showing that the PML Big Block Chevy valve cover has a good fit with grommet and chrome push-in breather cap installed   PML big block valve cover with breather and grommet, not installed PML Big Block Chevy valve cover, breather grommet, and chrome breather cap   Top view of PML big block valve cover with chrome breather PML Big Block Chevy valve cover, breather grommet and chrome breather cap installed, top view
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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).

Flyer

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.

Installation on 1949 Cadillac

Ben installed these valve covers on his beautiful 1949 Cadillac Series 62. His Cadillac features an Art Morrison chassis and a Chevy big block engine. Our thanks to Ben for sending us pictures of his installation.

1949 Cadillac with Chevy big block engine 1949 Cadillac with Chevy big block engine   1949 Cadillac with PML valve covers installed, passenger side 1949 Cadillac with Chevy big block engine, passenger side, PML valve covers   1949 Cadillac with PML valve covers installed, driver side 1949 Cadillac with Chevy big block engine, driver side, PML valve covers with Cadillac script
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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.