My valve covers have been leaking forever. I’ve tried both cork and rubber gaskets with crappy chrome plated steel (edelbrock 4449) valve covers multiple times over the years. Last week I finally tossed those and ponied up some bucks on the fancy fel-pro 1628 (thick rubber with steel inside) and cast aluminum valve covers (edelbrock 4262). No more leaks! However, now I’m hearing a tapping noise that I’ve never heard before (under load, mostly in first gear). Could this be a clearance issue with the aluminum valve covers? They actually appear to be a tad taller than the old chrome covers and the gasket I’m using now is thicker. Is something else going on and this is just a coincidence? Or am I slapping the inside of the valve cover?