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Dimensions:
Click here for dimensions.
Number of Bolts: 4 per stock cover, on the top, PML cover uses 2 bolt as PML cover is thick and rigid so 2 bolts is plenty for a no leak seal
Finishes: Read about finishes and construction of PML parts.
The valve covers feature vintage CORVETTE lettering and fins for a classic appearance. PML made these for GM Generation II LT1 and LT4 small block engines, center bolt mounting.
Benefits:
- Traditional look
- Heavy duty sand cast aluminum construction for secure two bolt clamping on the cylinder head
- Optional PCV/Breather/Oil Fill holes on intake manifold side for a functional yet clean design
- Gasket and new mounting bolts included
- Slightly taller than stock
- GM licensed product
Award winning two–bolt design: These valve covers won the SEMA 2007 Global Media Award for the two bolt mounting design. Stock valve covers have four bolts holding the cover on to the engine. PML two bolt design removes the two center bolts for an attractive presentation.
Because PML valve covers have thick wall, sand cast aluminum construction, they are much stiffer than stock and need only two bolts to apply pressure evenly to the gasket. PML valve covers will not tweak, bend, twist or deform. No leaks and a great look to dress up your engine.
The CORVETTE script and fins are cast into the cover and are raised. On powder coated parts, the powder coat is shaved off the top of the script and the fins.
Also available with CHEVROLET script.
There are two sets of these valve covers on special due to cosmetic blemishes. Both in polish finish. See: SPECIAL 410 and SPECIAL 423
Gaskets: One set of custom cork composite gaskets included with each set of valve covers. For additional gaskets, see Gasket for Chevy Small Block Valve Covers, Center Bolt.
Licensed GM product. All related Emblems and vehicle body designs are tradmarks of General Motors LLC, used under license to PML, Inc.
PML made these valve covers for GM Generation II LT1 and LT4 small block engines, center bolt mounting to the cylinder head.
These applications may have Chevy small block engines with center bolt mounting and be able to use these valve covers:
- Crate engines, such as ZZ4 and Ramjet
- 1987 to 1998 Silverado, Sierra, Suburban, Tahoe
- 1987 to 1998 Corvette, Impala SS, Camaro Z28
- Mid 90s Pontiac Camaro and Firebird
Configurations vary! Always check your engine before ordering. See SPECIFICATIONS for information on fitment and PCV/oil fill and breather holes.
These valve covers are larger than stock. On many stock engines, there is a bracket close to the stock covers that will need modifying to work with these PML covers.
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.
- Farm Truck by Art Morrison Enterprises
- 1928 Ford Roadster
- 1929 Ford Roadster
- 1932 Ford
- 1955 Belair Wagon
- 1959 Corvette
- 1964 Corvette, PML Natural Cast Finish Valve Covers
- 1964 Corvette, PML Polish Finish Valve Covers
- 1965 Corvette, PML Cast Finish Valve Covers
- 1965 Corvette, PML Polish Finish Valve Covers
- 1965 Corvette, 350 Motor, PML As Cast Finish Valve Covers
- 1965 Corvette, ZZ4 Motor, PML As Cast Finish Valve Covers
Farm Truck by Art Morrison Enterprises
This Farm Truck restoration by Art Morrison Enterprises includes PML small block Chevy valve covers with CORVETTE script and fins. Holes machined in the rear of both valve covers provide for PCV and a breather.
From left to right: truck, view of driver's side with push-in breather barely visible, view from passenger's side showing PCV connection
Click on image to view larger.
1928 Ford Roadster with Chevy S10 Rear Differential
This 1928 Ford Roadster was restored with a GM crate engine and a GM 7.5 inch ring gear rear differential from a Chevy S10. The restoration included PML valve covers and rear differential cover. The Roadster was featured in Hot Rod magazine in 2016 and did many cruises raising money for Make-A-Wish Canada.
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1929 Ford Roadster
Richard installed these valve covers on his 1929 Ford Roadster pickup with a Corvette LT4 motor. He used slightly shorter bolts than PML provided to get a good seal with these aluminum heads.
LT4 Corvette motor in a 1929 Ford Roadster
Passenger side of engine
Driver side of engine
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1932 Ford
This 1932 Ford at the Grand Nationals in January of 2011 shows these PML valve covers in polish finish with black paint between the fins and script. The engine is a ZZ3 350 and the transmission is a 700R4. This roadster belongs to Bryan in Riverside, CA and kindly allowed us to take some pictures.
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1955 Belair Wagon
Eric installed these PML center bolt valve covers on his 1955 Belair Wagon and says "they look awesome!"
Pictures from left to right: 1955 Belair Wagon, roller rockers, gasket on PML valve covers, PML valve covers installed
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1959 Corvette
David installed PML valve covers on his 1959 Corvette with a 350 Vortec engine, supercharged with Holley efi and four corner coilovers. He is very happy with the way the valve covers finished off the engine compartment giving it a high-end look.
1959 Corvette
PML valve covers, driver side
PML valve covers, passenger side
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1964 Corvette, PML Natural Cast Finish Valve Covers
Jerry selected natural cast finish PML valve covers to dress up his 1964 Corvette ZZ4 engine. PML machined one hole in each cover on the intake manifold side above the "e" in the CORVTTE script. Our thanks to Jerry for choosing PML valve covers and for the pictures. Images show (from left to right): orignal cover, Corvette, driver's side of the engine
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1964 Corvette, PML Polish Finish Valve Covers
Jim Smith installed PML valve covers on his 1964 Corvette with a GM 350 CID ZZ4 engine. Per his request, PML machined a hole on the intake manifold side of the cover on the driver's side for PCV. And it worked out perfectly. Our thanks to Jim for sharing his pictures.
1965 Corvette, PML Cast Finish Valve Covers
Levi sent us pictures of his 1965 Corvette Convertible. He did not take any pictures of the old covers because "it looked like crap." His Corvette has a Chevy Crate 350HO engine with a Muncie 4 speed. Our thanks to Levi for sharing his pictures.
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1965 Corvette, PML Polish Finish Valve Covers
Piper Automotive Service of North Miami (305-903-7946) sent us "before" and "after" pictures of this GM 350/345 ZZ1 engine. They made a few adjustments to get the covers to fit and are very happy with how great they look on this 1965 Corvette.
1965 Corvette Stock Valve Covers, passenger side
1965 Corvette Stock Valve Covers, driver side
1965 Corvette PML Valve Covers, passenger side
1965 Corvette PML Valve Covers, driver side
1965 Corvette
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1965 Corvette, 350 Motor, PML As Cast Finish Valve Covers
1965 Corvette Corvertible, 350 motor
Stock valve covers
PML valve covers installed
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1965 Corvette, ZZ4 Motor, PML As Cast Finish Valve Covers
Gary loves these valve covers. He ran the covers in his vibratory tumbler for 15 minutes to give them a bit more factory sheen appearance.
1965 Corvette Coupe, GM Crate ZZ4 Motor with PML valve covers, passenger side view
PCV on passenger side, breather on driver side
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Fitment
Click here for dimensions. Use these dimensions to check if PML valve covers will fit on your engine.
PML fits each valve cover on an original GM cast iron cylinder head.
Click on image to view larger (CORVETTE script covers fit the same)
These valve covers may fit differently on aluminum or aftermarket heads. Keep this information in mind:
- PML covers are slightly larger than stock.
- The extra height allows for many types roller rockers but not all.
- Check for interference. Some engines have a bracket or other parts that sit close to the stock covers. Some customers have reported modifying their alternator bracket so these covers will fit.
PML Small Block Valve Covers with Rocker Arms
PML designed small block Chevy valve covers to work with many roller rocker systems. However, our valve covers are not compatible with shaft mounted rocker arms such as T&D.
Click on image to view larger.
The T&D Machine Products Competition Rocker Arms are shown in this image. The shaft mounts are very tall, almost to the top of the rocker arms. The PML cast-in internal baffles will contact these mounts.
Any rocker system must have space between the rocker arms for the baffle webbing inside the PML valve covers to fit between the arms.
Inside of PML Valve Covers and Baffles
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Image shows inside of a valve cover. The areas next to the bolt holes are baffles for optional PCV and breathers. These are cast–in.
Optional PCV, Breather and Oil Fill Holes
If these valve covers are ordered with machining for PCV, Breather or Oil Fill holes, there is no return or refund. This would be custom machining and the sale is final.
Read this PDF file on oil fill, breather and PCV holes (click here).
PML small block valve covers are made without holes for PCV, oil fill or breather. PML can machine holes to your specifications.
For engines that require PCV and breather holes on the valve cover, PML designed the casting to be thicker on the intake manifold side and put baffles on the inside in two locations for holes. The top of the cover cannot be machined.
A separate oil fill hole is not needed since the PCV or push-in breather can be removed and oil added there.
Click on image to view larger.
PML uses four or five different tools on a CNC machine to create a clean, leak-free hole for PCV, breather or oil fill. Spot facing provides a smooth sealing surface for grommets.
To learn more, we have two videos.
The information is generally the same although a different PML valve cover is shown in these videos.
When ordering holes, you will need to specify the hole location. Holes can be machined on the passenger's side cover or on the driver's side cover, towards the front of the car or towards the rear. You can choose the location and type of hole needed in the shopping cart or can call to order. International customers, please email us for ordering.
Included With Valve Covers
PML includes new mounting bolts and a set of our custom cork composite gaskets with the valve covers.
An example of what is in the box is shown below for a set in orange powder.
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Gaskets
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PML includes a set of our thick, cork composite gaskets with our valve covers. Gaskets are approximately 0.25 inches thick. We designed these for easy installation and to provide a leak proof seal. For additional gaskets, see Gasket for Chevy Small Block Valve Covers, Center Bolt.
Depending on the engine configuration, using less thick gaskets or gaskets made from other materials may cause installation problems or not completely seal. For example, PML valve covers have a rail to hold the gasket in place while placing the valve cover and gasket on the cylinder head and if a thick gasket is not used, the rail may contact the cylinder head, preventing a good seal.
PML Valve Covers 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.
