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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.
These PML valve covers for LS engines feature a tall height and a clean design with raised fins. They are heavy duty and larger than stock.
Two recessed bolts per cover (stock uses four) hold the cover on the engine. The sand cast aluminum construction provides stiffness so four bolts are not needed to apply pressure evenly to the gasket.
This PML design located the PCV/breather/oil fill hole in the center on the intake side. The stock covers have the oil fill on the top. With PML covers, a hole on the intake manifold side is used for oil fill, in keeping with the clean, classic design.
We have one set of our LS valve covers on SPECIAL.
Relocation of the coil packs if the responsibility of the installer. Always verify engine configuration, dimensions, and clearance before ordering.
Gaskets: One set of custom cork composite gaskets included with each set of valve covers. For additional gaskets, see Gasket for PML Chevy Small Block LS1 and LS6 Valve Covers.
Click on image to view larger.
PML designed these valve covers to replace the stock covers (shown in image). PML valve covers fit the stock GM center bolt cylinder heads used in 3rd generation LS Chevrolet® small block engines, 1997 and newer. Versions of these heads are found on Corvette, Silverado/Sierra, Tahoe/Yukon, Camaro/Firebird, and GTO's.
Some early Gen III engines in 1997 and 1998 have 9 bolts on the perimeter of each cover. These PML valve covers will not work with the 9 bolt perimeter mount cylinder heads.
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.
GTO by Willoughby Hot Rods
These images are courtesy of Tim at Willoughby Hot Rods. They are showcasing Devin Houston's 1970 GTO SC/Tiger. PML valve covers installed. This animal is equipped with a Quick Fuel blow through carburetor and 600 horsepower exhausting through a Pypes 3" stainless system.
Street Trucks Magazine, March 2012 Issue
Click on image to view PDF of article. A new window or tab will open.
Street Trucks magazine shows the installation of PML LS valve covers on the build of Brass Tacks, a street rodder transformed from a 1976 GMC Jimmy.
Click on image for a PDF of the article. A separate window will open and display the pdf file.
Our thanks to Jason Mulligan and Street Trucks.
Grand National Roadster Show 2017
We saw this beautiful truck at the Grand National Roadster Show at the Fairplex in Pomona, CA, in January 2017. The engine does a nice job showing off PML's LS valve covers in the polish finish.
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Minge's Universal Service at the Oslo Motor Show, Norway
Minge's Universal Service (www.minges.no) offers PML valve covers on their high performance engines. These images are from Minge's booth at the Oslo Motor Show, November 2011.
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PCV, Breather, Oil Fill and Optional Machining
These valve covers have holes cast into the intake manifold side of the cover for PCV, oil fill and breathers. The holes are 1 inch in diameter. Some applications require larger holes, for example 1 1/4 inches. The cast-in holes can be machined to the larger size if needed.
PML has a machine shop on-site and can machine holes. There is a charge for machining. Please call to order machining and discuss the specifications.
Images below show an example set-up. Holes on the valve covers were both machined to larger 1 1/4 inch. One cover has a push-in breather (center image) installed. The other cover has a PCV valve with grommet. Push-in breather and grommet both available from PML.
This shows the inside of the cover machined for the push-in breather with the breather installed: 
Click to view larger image in a separate window or tab.
Gaskets
PML designed our valve covers and gaskets for a secure seal. PML supplies one set of our gaskets with each order.
PML LS valve cover gaskets, cork composite material
PML LS valve covers and gaskets
PML LS gasket have peel and stick adhesive on back
Click on an image to view larger in a separate tab or window.
The gasket is a cork composite material and are "peel and stick" for ease of installation.
PML valve covers will not work with stock gaskets and PML gaskets will not work with stock valve covers.
One set of custom cork composite gaskets included with each set of valve covers. For additional gaskets, see Gasket for PML Chevy Small Block LS1 and LS6 Valve Covers.
Coil Packs
Coil packs will need to be relocated in order to use these valve covers.
Baffles
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Valve covers feature internal cast-in baffles. Inside of cover pictured at right. The baffle is in the center of the cover where the PCV/oil fill/breather hole is located. The hole is 1 inch but can be machined to 1 1/4 if needed.
Fitting Valve Covers on Cylinder Head
PML puts each set of these PML valve covers on an origingal LS1 head to verify the fit before shipping. These valve covers must be fitted on the head using a PML custom gasket or the covers will not fit correctly.
