PML Valve Covers for Chevrolet® 396, 427, 454, & 502 Big Block Engines
$350.00 (set of 2)
Black powder coating
$480.00 (set of 2)
$550.00 (set of 2)
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:
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.
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 Chevy valve cover, breather grommet, and chrome breather cap
PML Big Block Chevy valve cover, breather grommet and chrome breather cap installed, top view
Click for dimensions.
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
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, passenger side, PML valve covers
1949 Cadillac with Chevy big block engine, driver side, PML valve covers with Cadillac script
PML Valve Cover Features
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.
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