Seat came out? Another reason not to use cheap casting cylinder heads. The more I read on here the problems guy's are having with the imported cylinder heads make edelbrock heads look better at least they are cast here
My oldest son runs a set of edelbrocks that were bought dirt cheap. The reason: An exhaust seat had fallen out. We found 2 ex valves with cracks in them, that is what I think went first in his. We fixed them ourselves and they have been good since. I don't think it's just a procomp thing.