23' Performance 5.0 vs 5.7 Mercruiser

[Bushwacker]

Originally Posted by FishStretcher

So with a Bravo 3 on a 25, would that be as bad? Just thinking about the siamesed exhaust ports on a SBC. It still would weigh less than dual 6 cyinders.

Fish, even though it weighs less than twin 6's, the 454/7.4L engine is still quite a bit heavier than the small block 350/5.7L, so it makes more sense in the much heavier 27 than it does in the 25, which is known to be sensitive to stern weight. CSC member 3rd Day has a 7.4L in a 27' Seamaster and was complaining about fuel consumption in it, so you might send him a PM to get more details. I think I'd pick a FWC 350 w/aluminum heads and a DuoProp or Bravo 3 drive over the big block engine. The small block MPI heads have lots of development work in them and make pretty good power, so if you can get enough speed at an acceptable vacuum level with that combo, why run anything heavier?