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Made in USA
Dimensions:
Click here for dimensions.
Number of Bolts: 7 per cover, on the perimeter
Finishes: Read about finishes and construction of PML parts.
These heavy duty valve covers from PML for big block Chevy engines feature raised CORVETTE script and fins and top quality construction. The classic CORVETTE script is licensed from General Motors. These covers are the same for both the driver and passenger side for a consistent look. Some engines require a relief or indent in the driver side cover for the brake booster. For those enginers, please see PML valve covers with a brake booster relief on the driver side.
Chevrolet big block engines include: 396, 427, 454, and the 502
Benefits:
- Traditional fins and script design
- No relief for a brake booster on the driver side for a consistent look
- PCV and oil fill/breather holes with grommets
- Holes have internal baffles cast to reduce oil blow-by
- Top quality sand cast aluminum construction with thick walls for strength
- Precision-machined 3/8-inch thick gasket flanges for a leak-free seal
- Cast in oil drippers on the inside
- Made in USA
- GM licensed product
PML also makes tall height valve covers and valve covers with a brake booster relief on the driver side.
New mounting bolts are included.
PML valve covers are sand cast aluminum. This is different than the original valve covers. Read about the Finishes and Construction of PML's products. PML does not polish between the fins.
We have some of these valve covers on SPECIAL:
- Special 409 (two passsenger side covers, no brake booster relief, polish finish)
- Special 454 (two passsenger side covers, no brake booster relief, polish finish)
- Special 458 (two passsenger side covers, no brake booster relief, as cast finish)
- Special 459 (two passsenger side covers, no brake booster relief, as cast finish)
- Special 475 (two passsenger side covers, no brake booster relief, as cast finish)
PML designed these valve covers using original GM cast iron heads. Chevrolet Big block engines include: 396, 427, 454, and the 502.
Engine configurations vary and PML cannot guarantee fitment. Check your engine configuration carefully before ordering.
- These valve covers are standard height on the inside but taller than stock on the outside because of the thick walls and script and fins on top.
- For engines without a brake booster
On the inside, some rocker arm systems have contacted an inside corner of the PML valve covers. Some customers have had to remove a bit material from the rockers.
Loaner Program
We want to make sure you get valve covers that will work on your engine and you love looking at. With that in mind we have a program for borrowing a PML valve cover to test fit on an engine. Learn more about the PML Loaner Program.
Included with Valve Covers
These PML valve covers ship with new mounting bolts and PCV and breather grommets installed.
cast finish valve covers package
black powder coat finish valve covers package
orange powder coat finish valve covers package
polish finish valve covers package
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Inside of Valve Covers
These PML valve covers have oil drippers on the inside and the PCV and breather holes are baffled.
baffles and oil drippers on inside
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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. Either of these holes can also be used for oil fill by removing the PCV valve or breather.
These holes work with standard 1 1/4 inch grommets. The breather grommet has a 1 inch inner diameter for a standard breather cap. The PCV grommet has a 3/4 inch inner diameter for a standard PCV valve.
Breather grommet:
grommet for a breather provided with PML big block Chevy valve covers
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 installed, top view
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PCV grommet:
grommet for a PCV valve provided with PML big block Chevy valve covers
PCV valve installed on PML big block Chevy valve cover with grommet
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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. The PML tall version of these valve covers is approximately 3/8 inch taller.
PML Valve Covers Compared to Stock
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