What should be my expected numbers and all around performance going from a Re-Grind 236/242 580/590 to the MS4? Last but not least. Which one of these cams would work best with the LS6 2.5 heads and what would be my expected nums? So in other words if you all could help. What would be my numbers cam only & What would be my numbers H/C?
See Sig for Mods.

 

My biggest concern with those heads and cam would be PTV clearance. Are you getting the heads from Texas Speed (because I believe they alter the valve drop to increase PTV)?

 

The heads will be coming from Texas Speed.

 

i cant find the thread but there was a guy up here some where who had both cams and swap them to which was better and he put down 18 more rwhp with the 580/590 236/242 cam. my numbers suck but mine put down 368 rwhp through a th350 and a 3800 stall. but autos aint dyno queens. this guy did it through a six speed. hope this helps.

 

almost positive youre going to run into PTV clearance issues. i think the stage 1 ls6s work, 2.5+ do not. call TSP just to be sure.

gains? maybe 30ish.

**edit- so am i reading youre sig right? its a 383?

 

hmm.. interesting!

 

With a 383, you'll pick up, but I would go bigger cause of the 383ci.