I can feel a loss, at first I hoped it was a tack or off reading but the boats down 2-3 mph also..

haha maybe that's the issue!!

How many hours ago, though? Might be worth another quick check just to make sure it is nothing internal cropping up. Tranny maybe?

I can't see how this would be Stecz's fault, but you never know.......

Fuel pressure the same on both engines?

Mark

my guess is valve seal issue on one engine.time for another leak down check.

20 hours ago, also remember rpm drop was there before last falls compression testing so that's not gonna be it, also if engine was down a cylinder that would have shown on dyno also.

Why would they dyno identical then? Was down most of last summer, dynoed identical and still down, not sure how that can be a cylinder issue, yes I know I have potential disaster bob cams but if down a cylinder that woukd have shown on dyno. I could be wrong but the issue was there way before dyno, not on dyno then again after dyno, so I don't think it's mechanical in engine.

Yes 6-7 psi

If it has not been mentioned earlier within this thread, then a leak down test is one of the best tests you can do as suggested here by Mike Tkach....it eliminates a lot of guess work-----and it does not matter how fresh or new the engines are.