Just a thought from a novice in the peanut gallery. What would happen if you drop a 1050 dominater on it and solid roller lifters? If it still flattens out, could it be a valve spring issue? Sad to say, it COULD possibly be a combination of issues, not just one?

Last edited by gregsdart; 12/20/23 06:22 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky