Originally Posted by Fabien
The boat is 4188 lbs , i tried a few time with me and my buddy or me and the 2 kids . No gear exept the required safety equipment and a couple snacks , gas was between 3/4 and full . And i was trimmed the best i could . ( trimmed guage is not working but i go by the rpm and the sound ) . The holding tank was a 1\4 full ( about 10 l in it ) .
This may be a little late but I have the same boat with the 5.0L engine and I get about 41 mph WOT at around 4400 rpm. I think that was with a beat up old aluminum 19" 3 blade prop. I now use a 4 blade comp prop and get slightly less speed but it seems to plane a lot better.
Your boat is more than 4188 lbs - that number is the dry weight for the 5.0L engine as I understand it. But, through talking with others, that boat with 1 passenger and fuel, supplies etc it likely around 5500 in the water. I am an equipment-holic and a heavy dude to begin with so I expect mine is even heavier and I still get near 40 mph.
This year I am installing smart tabs and a SS prop. I forgot to mention as well that I run a Dol-Fin ventilation plate on it too which seems to improve hole-shot but definitely improves handling and the ability to trip further up and still not get ventilation.
I expect you just need to tweak your set-up some...unless you've got low compression in one or more cylinders.