Do you have hood clearance for a Performer RPM? 5100 isn't alot of RPM for a 383 with Stealth heads. Maybe with a 440, but I think the 383 should wind up a little tighter.

The times are respectable but I think you could/should be able to get closer to 105 mph out of that combo, and I'd think it should wind up to 5500 or 6000 with ease. The DP4B is a decent piece but an RPM may help. Have you exhausted tuning efforts?

Last edited by GTX MATT; 01/11/16 07:56 PM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street