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.