It's not all about top speed.
Quote:
Originally Posted by
TheSharkGuy
My mechanic down where the boat is has a 454 that he can build for me. Says it should put out around 425HP and he will give us a 1 year warranty. He also has a 502, but he doesn't want to part with it.
How much faster should the 425HP Big Block run compared to the 350HP Small Block?
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My guess is that lightly loaded the boat will be 5mph faster on top with the 425HP/454.
It will be able to run a larger prop so midrange speed will probably be a larger difference.
The big block will have a lot more torque so it will accelerate far better and will carry heavier loads better.
I've owned 3 Donzis- a 1975 18 Classic with a 320HP/350 , 1987 20 Minx with a 270 then 300HP/350, and a 22 Classic with 415/502.
The 22C with 502 is a far better performer because of the big block; boat accelerates like mad...:shades: