PML CADILLAC® 331, 365, 390, 429 Valve Covers

Description

Dimensions: Click here for dimensions.

There is 2.48" from the gasket surface to the top inside surface. On the outside, check for clearance with air conditioner, bracket, heating, cruise control and other parts.

Number of Bolts: 4 mounting bolts per cover, on the perimeter

Finishes: Read about finishes and construction of PML parts.

These PML heavy duty valve covers offer classic styling and extra space for many roller rockers systems.

The CADILLAC script and fins are cast into the cover and raised (not engraved). The script replicates the 1949 GM CADILLAC logo. To highlight the CADILLAC script, powder coat is brushed off the top of the script and fins on the black powder coat finish, and on polished parts, we do not polish between the fins and the script.

Benefits:

Classic CADILLAC script and fin design
For 331, 365, 390 and 429 Cadillac engines (see APPLICATIONS section for more information)
Heavy duty, sand cast aluminum construciton for thick, stiff, walls and gasket flange
Machined gasket surface for a secure seal
Extra height and pockets for many roller rocker systems
Licensed GM product
Made in USA

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

Applications

These PML Cadillac valve covers are designed for 1949 to 1967 Cadillacs with 331, 365, 390, and 429 V8 engines with four bolt valve covers.

These are larger than stock and not intended to be bolt on replacements for the stock covers.

Engine Considerations

1. These valve covers are perimeter mount, with four bolts per cover, included. Some early engines require center bolt mounting and PML does not have valve covers for these engines.

2. For 1963 to 1967 390 and 429 engines, these PML valve covers will fit on the heads although the shape of the OEM stock valve covers is different from the shape of the PML valve covers. The cylinder heads and PML valve covers are rectangular. The OEM stock valve covers are curved at the corners on the intake manifold side. You must use the PML gaskets or earlier 1954 specified gasket for the PML valve covers to seal. The bolt holes line up fine. Pictures show the OEM 390/429 valve covers, PML valve covers, and the area on the cylinder head.

OEM 429 and PML valve covers flange shapes bolt holes space on cylinder head
Click on image to view larger.

3. These valve covers are taller than stock with pockets to work with many roller rocker systems. Be sure to check clearance on the inside and outside for your particular engine configuration.

4. Stock engines may have air conditioners, heaters, cruise control units or other items close to the stock cover so these larger PML covers may not fit without modification. Click here for dimensions of PML Cadillac 331, 365, 390, 429 valve covers. On some stock engines,the compressor bracket hits our cover.

5. Most applications breathe through the valley plate so these valve covers do not incorporate a provision for breathers or PCV.

6. See Specifications for gasket information.

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.

Installations

Our thanks to those who have emailed us pictures of their Cadillacs and our valve covers. Additionally, we have spotted our Cadillac valve covers installed on some beautiful restorations at car shows.

1957 Sixty Special

Sten in Denmark emailed us these pictures of his 1957 Sixty Special. He dressed up the Cadillac 365 engine with these PML valve covers in the cast finish.

PML valve covers on 1957 Sixty Special 365 1957 Cadillac Sixty Special Passenger side view of PML covers on a Cadillac 365 engine in a 1957 Sixty Special Passenger side view of PML covers on a Cadillac 365 engine in a 1957 Sixty Special
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1957 Fleetwood 60 Special 365

Lou installed these PML valve covers on his 1957 Cadillac Fleetwood 60 Special with a 365 engine bored and stroked to 396.

1957 Fleetwood 60 Special Cadillac 365 motor in 1957 Fleetwood 60 Special, PML valve cover driver side of 365 with PML valve cover
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1960 Cadillac

The pictures below are of a 1960 Cadillac 2 door hard top with a 390 engine in Finland. The PML valve covers are in the natural cast finish. The owner decided to polish the top of the fins and script to give a little shine to the engine.

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1960 Cadillac Series 62

For a completely custom look, the customer purchased the cast finish, removed the fins above and below the CADILLAC script, then hand polished the covers.

Owner and his restored Cadillac Series 62 Cadillac Series 62 Cadillac Series 62, driver side of engine Cadillac Series 62, passenger side of engine
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Grand National Roadster Show 2020

1961 Cadillac

The pictures below are of Brent and Dana's 1961 Caddy at the SEMA show in November 2010.

1963 Cadillac Series 62

Mark installed these valve covers on his 1963 Cadillac Series 62 with a 390 engine.

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1963 Cadillac Series 62 390

Smithy Customs in Texas installed these PML valve covers on a 1963 Cadillac project.

1963 Cadillac Series 62 390 motor PML valve covers 1963 Cadillac Series 62 390 motor
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Roadster

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1952 Allard

We took these pictures of a 1952 Allard J2X at the Grand National Roadster Show in January 2012. Lime Works Speed Shop did the restoration and the owner is Allan Beall. A 1953 Cadillac 331 cu. in. engine was installed and modified.
Additional pictures in our Facebook album.

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Cad on the Impaler

We saw this 1934 Ford with a 331 Cadillac V8 at the Grand National Roadster Show in January 2013. The PML valve covers, in the polish finish, look great on the engine.

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Specifications

Inside of PML CADILLAC Valve Covers

Inside of covers. Click on picture to view larger in a separate window or tab.

PML Cadillac valve covers have an open interior and pockets to clear most roller rockers. The picture also shows the thick, precision-machined gasket flange and the four mounting holes on the perimeter.

Gaskets

PML designed these Cadillac valve covers to work with many stock gaskets. There are five different gaskets available. Later year gaskets (after 1955) may not work with these covers.

We recommend using the 1949 to 1955 4-bolt gaskets. PML sells gaskets for these valve covers. Also, some of our customers have reported that FelPro part number 5392 gaskets work well with these valve covers.

These are pictures of the cork composite gaskets PML offers. These can be added to an order over the phone or in the shopping cart.

Gaskets for PML Cadillac valve covers, click to view larger image Gasket on PML Cadillac valve covers, click to view larger image
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