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Dimensions:
Click here for dimensions.
Overall, these valve covers are about a 1/2 inch taller than stock.
Number of Bolts: 6 mounting bolts per cover, on the perimeter
Finishes: Read about finishes and construction of PML parts.
PML designed these valve covers for the classic hot rods of the 1950s and 1960s with the 348 or 409 Chevy™ W block engine. The CHEVROLET script and fins are cast into the cover and raised for a classic look.
Benefits:
- Classic styling with CHEVROLET script and fins
- Heavy duty sand cast aluminum construction
- Thick walls provide strength
- Gasket flange will not bend or flex when bolts are tightened
- Licensed GM product
- Made in USA
The script and fins are cast into the covers and are raised. On powder coat finishes, the powder coating is brushed off the top so the lettering and fins stand out. On the polish finish, we do not polish between the fins and script to add contrast.
PML also makes 348, 409 valve covers without script or fins for engines needing a clean, unbranded design that can be customized.
We have a single and one set on SPECIAL: Special 229 (single, not a set) and Special 453 (polished finish set with cosmetic blemishes)
Licensed GM product. All related Emblems and vehicle body designs are tradmarks of General Motors LLC, used under license to PML, Inc.
PML designed these valve covers for Chevy™ 348 or 409 W block engines.
PML fits each valve cover made on a 348 stock head during manufacturing. This verifies that the covers fit.
PML covers are heavy duty with thick walls and are larger than stock. Always check your configuration to make sure you have space for larger valve covers.
Read our Return Policy before ordering.
After reviewing the dimensions and specifications for these valve covers, it may still be difficult to determine if a PML product will fit a particular engine configuration. PML has a loaner program if needed. See our Valve Cover Loaner Program for details.
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.
PML valve covers have been installed on a many restorations and classics. Our thanks to those who have emailed us about their restorations and allowed us to share their pictures.
Counting Cars, Season 9, Episode 3, Big Love Buick
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A custom Buick renovation by Counts Kustoms in the TV show, "Counting Cars",
uses a Chevy 409 engine with PML valve covers.
This beautiful restomod will be auctioned to raise money for NFT2, a rare disease.
Watch the episode on Facebook tv: Big Love Buick on Facebook TV
See it on YouTube: Big Love Buick on YouTube
1955 Nomad
Classic Car Studio (www.ClassicCarStudio.com) restored this 1955 Chevy Nomad , "Gone Mad". For the engine, they used a World/BMP 509 aluminum block with PML valve covers.
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1964 Corvette
Andy at Edwards Design and Fab "had to have a pair" of PML valve covers for his 1964 Corvette Coupe. The valve covers are in polish finish.
The engine is a 440 cubic inch 409 wth Hilborn fuel injection, Edelbrock heads, eagle crank, H-beam rods, custom ground roller cam and Billet Specialties pulleys. They machined the stacks and the thermostat housing.
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1961 Impala
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Ken sent us a picture of our valve covers on his 1961 Chevrolet Impala.
He purchased these PML valve covers in polish finish and customized them with orange paint on top of the CHEVROLET script to highlight the classic Chevrolet orange color in the engine.
1928 Ford
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John Stewart shared this picture of PML 348, 409 valve covers on his 1928 Ford sedan with a 1932 Ford grille. The valve covers are in the black powder coat finish.
Impala SS at Cruisin' For a Cure Car Show
We saw this beauty at the Cruisin for a Cure car show in Costa Mesa, CA, in 2011.
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Inside of Valve Covers
PML 348, 409 valve covers have an open interior. This allows space for some roller rocker systems. PML valve covers are heavy duty with thick walls and larger than stock so always check clearance for larger covers.
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Fit on Cylinder Head
PML fits all valve covers on a cylinder head.
348, 409 cylinder heads have posts on the intake manifold side near the bolt holes. The height varies from head to head. Sometimes these posts have been machined off. PML valve covers have recessed areas for these posts. Rarely, a cylinder head will have posts that are large and do not fit in the recessed areas. We have only heard of this on a few 409 heads. The recessed area is 5/16 (0.31) inch below the flange surface.
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Included with Valve Covers
PML provides mounting hardware with the covers.
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Gaskets
Gaskets are not included with these valve covers. PML recommends cork composite gaskets for these valve covers. Some trimming may be needed to make a gasket fit correctly.
PML offers cork composite gaskets for these valve covers. The PML gaskets are 0.180 inch thick.
Gaskets for Chevy 348, 409 valve covers
Gaskets for Chevy 348, 409 valve covers on PML valve covers, view shows gasket thickness
Gaskets for Chevy 348, 409 valve covers on PML valve covers
PML Valve Covers Compared to Stock
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