I would be in favor of porting the heads, and putting some beehive springs on it and the highest rocker ratio the whole deal will tolerate. I used an ERSON 1.75 ratio rocker many years ago on a 590 cam with ported 906 heads, and it worked well. If you don't have this cam advanced, you can work with that also. My friend Joe is making great power running that cam in a 446 with it in a 100!

Last edited by gregsdart; 03/21/14 11:52 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky