400 to 512

We have indy sr heads (ported but nowhere near maxwedge size intake ports) on a 12-1 499 with a sft cam with mid 600s lift and a bunch of 050 dur. runs mid 9s going solid roller this yr and we should see some gain.
Good luck
Jr.
Been three seasons on this engine with no issues,sometimes back to back hotlaps...no issues.