Dimensions: Click here for dimensions in a pdf file. A separate window will open and load the file.
Number of Bolts: 4 per cover, on the perimeter, staggered bolt pattern
Finishes: Read about finishes and construction of PML parts.
These sand cast aluminum valve covers feature raised CORVETTE script lettering and 7 fins. They have perimeter mounting with staggered or offset bolt holes for 1955 to early 1959 cylinder heads. The mid height design clears many roller rockers.
- Traditional CORVETTE script and fins
- Heavy duty sand cast aluminum construction
- Thick flange will not tweak when bolts are tightened
- Staggered/offset bolt pattern for 1955 to 1959 cylinder heads
- GM licensed
These valve covers do not have a provision for PCV, breather or oil fill because the original valve covers did not have a provision for PCV, breather or oil fill. This was done in the intake manifold.
General Motors Trademarks are used under license to PML, Inc.
These valve covers fit Chevy small block GM cylinder heads with the staggered or offset bolt pattern. Four bolts on the perimeter of the flange hold the cover on the head. This bolt pattern was used from about 1955 to 1959.
These valve covers are larger than stock. Check for clearance for larger covers before ordering.
1957 Corvette 283
David installed these PML valve covers on his 1957 Corvette with a 283 small block Chevy engine.
Gaskets are not included with these valve covers. PML designed these Chevy Small Block Perimeter Mount Valve Covers to work with cork composite gaskets.
Mounting Bolt Holes
The holes to mount the valve covers on the engine are about 8.8 inches apart (center to center) on the intake or inside edge and 10 inches a part on the exhaust or outside edge.
Inside of Valve Covers
Interior is open, same as stock covers.
PML Valve Covers Compared to Stock
PML valve covers are sand cast aluminum, so they have thicker walls, are taller, and have a rougher texture.
Many original valve covers were die castings or stamped steel. Both have a smooth surface.
The images below show this PML valve cover compared to a typical die casting, GM part 3726086.
Read more about finishes and construction of PML parts.