if your valvecover grommets are old, then are probably too compressed and not able to snug all the way down, i had the same issue, rerplaced them and it quit. you just cant get any tension on the cover if the grommets are too compressed
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10.02@149.5 Bullseye Power Turbos
Top Dead Center Performance
Mobile Alabama 251 661 6067
owner/operator
www.tdcperformance.net