Congratulations Greg, that sounds like a great improvement to the combo!

My 557 also peaked at 7,200 rpm but does hang in there higher as well... We also found the optimum spark plug burn at 34 degrees total on the Dyno.

We made best power on the Dyno using 37 nozzles and a 76 pill, but the car went a tenth quicker at the track when I increased to 38 nozzles same pill. That is with the -1 pump.

What size nozzles are you using?

Good luck at the track, I am anxious to hear how much you pick up!

Arnie