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i have the same valve covers, and they would not seal no matter what i did. turn the valve cover over and put a straight edge on the rail where the welds were ground from the manufacture. you will see that the weld is still high and it is not letting the valve cover to seal along the center of the valve cover. I had to take a hand file and file the welds down to match the ends and the center of the valve cover. the center of the covers are a one piece formed alum. and the ends are another formed piece and where the two formed pieces were welded together along the rail is the problem. once i files this area they never leak again.



I noticed the same thing, I filed all the high spots and found 2 screws that were too long, thought for sure it was gonna seal this time but nope.

I might try to do some more filing tomorrow, I know it's not perfect.

By the way, who makes these covers and what do they cost?