I'm using the Summit valve covers also. I bought them maybe 6 years ago? The upper bolt holes were in the wrong location, too low, they might have fixed this since. Easy enough to fix with a die grinder. Also I had to put a small notch in the passenger side valve cover to clear the MSD distributor. I've probably had the valve covers off and on maybe a half dozen times this year alone, all in all the look good and seal well with Moroso 93055