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
Its crazy how the location is different from each head manufacturer. That is why the valve cover holes are so big and even that doesn't always work.
In a previous post I posted the bolt hole dimensions of several heads including TF270. I have fixed several valve covers for folks over time to fit their heads..
