This helps open the window for tuning and help it be more forgiving. At 150 level tune don't have be perfect.. but my motor is setup for a 400 shot. Not that I'll spary that anytime soon.. but it got all the tuning windows done to help it at that level.

 

so after seeing your other posts I went back to find your build and I found some interesting reading...what machine work did you end up doing to the heads or other areas to warrant a 400 shot. What cc chamber/quench relationship did you end up with after "softening" chambers.