Well that’s the best I can do on this set of heads.

RAMM said
What kind of power does the customer expect? Over 600HP? The heads are capable of that I'm sure youre aware. J.Rob

The car ran consistent 6.60’s last year with my son driving. Typical .650-.690 roller cam 408 with TrickFlow heads. They are hoping for some 6.30’s-6.40’s I’m guessing. Car is in the 3100 pound area.