Summary, I spent the last 4 months rebuilding the engine. I added a 6/71 blower. With the intake & carbs, I would say the two weigh somewhere around 100lbs. Before the Blower. At 4900 rpm the boat ran a solid 73 + on GPS. Now with the blower, 4lbs of boost (8% under driven) 5500 rpm the boat runs 69.9 on gps.
If I now picked up 100 extra pounds but increased the rpms by 6k should I be at least equal to what I was running?
I did change out the cam for a blower friendly cam with less duration.
If I increased the rpms shouldn't I have a bit more speed or is that 100 lbs extra that much more a negative than a positive???
I have a thread in the West Coast South that show the build. Oh and the videos that I show with me running the engine are with the PTO disconnected.