Alright here's the deal. I have a 21' TPR pickle fork. When I bought it 3 years ago I threw in just a basic little over stock .030 454" with a Comp 280 cam, small oval port heads with a rectangle port Team G and a 1050 dominator. The intake and 1050 were all I had at the time so thats why I used it. The boat ran pretty well for the power, I would guess 350 to 400 hp. It turned 5200 rpm and GPS'd 60 mph.
Fast forward a year, I built a 602" BBC, I wanted it to be fairly low maintance and relaible. It is 11.3/1 comp., roller cam, Bowtie heads, profiler sniper intake and a 1150 dominator. Again, I wanted a low maintance big inch engine, that I could cruise with and still build decent power. I was shooting for 750 to 800 hp. No dyno numbers just a guess. I put it in the boat with no hardware changes made. Same MSD system and same Aeromotive fuel pump/regualtor were used as with the 460". Took the boat out and it ran 90 mph. Boat picked up 30 mph with the engine swap, which I am very happy with. The problem is that the engine RPM's the same 5200.
Why would you guess that two different engines with probally 3 or 4 hundred horse power differance would RPM the exact same without a single hardware change? It's not the tach, on the trailer with the driveshaft disconnected it will tag 7000 real quick. Im stumped, any ideas?