[DealsGapCobra]

Simple question...are both runs corrected to standard sea level conditions? This is a very reasonable thing to do and should be done. However, this would not explain the peak power being at a different RPM.

Did the guy in PA add any numbers? This is, in my opinion, not a reasonable thing to do and was probably not done. However, I know quite a few engine shops that use engine dynos "adjust" the numbers for a bunch of BS reasons (like internal friction, estimated accessory drag, etc) and then report power produced. They do this so that the customer can say (and think) he has a 450 Hp engine when it only produces 400 at the crank.

With the loss in high RPM power I would check the total timing (the distributor curve will be inconsequential at this RPM) and the fuel delivery.

Good luck.

Rob