Thank you both gentlemen. I appreciate you taking the time to reply.
It did seem odd ball- so we’ll figure out some thing. The installed height is 2”, ferrea valves. These heads are not stock, heavily ported and shaved etc. Make good power though, but everything is a challenge with them. They’ll be for 1/4 mile. I don’t imagine we’ll ever know why they were turned down to .600 ish.
-Dana

Of course no one needs that much power. But life is about WANTS! Not NEEDS!