Saw a picture I believe in a Chevy rumble magazine article was on Lamar Walden I saw his little aluminum spacers and I had to have them so I had a guy wittle them out of aluminum for me at work....
After reading about leaking covers.... my motor has never been run, so they’re not proven...... I can’t see that it would be a problem because I would think they would have the same clamping force and surface area as the bolt....???