Just get the Mahle or other OEM gasket and have no problems. I had an "Ultra-Power" gasket that wouldn't stay in the grooves of the cover...what a waste of time to try and make that work. The Mahle was snug and perfect. The exhaust valves on Cylinder 1 were a bit snug, so, loosened those up 1/8 of a turn to bring it within spec. This is what the valvetrain at 122,000 miles looks like after a diet of Pennzoil Platinum 0w20 plus the current fill of HPL 5w20 no VII for a few thousand miles.