Quote:
Originally Posted by Step Up
So I have this 1974 20 foot Sceptre it has the original 6 in it. I want this boat for a run about only. So I was thinking pull the 6 and go 5.7 or 5.0 but then I was thinking why. I am not building a race boat. But I would like to spruce it up the 6 a bit.
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I put a 5.7 in a 20 Bertram that originally had a 165 in it - with the 5.7 it was fast but I
REALLY wished I had left the lighter/smaller motor in it; changing plugs was awful and usually involved blood, it didn't self bail at the dock, trimming it was hard, and it 'wandered' at idle with all that weight aft.
The only way to get more power is to move more air through. I am pretty sure 292 I6 block is the same as the 250 with a taller deck and longer stroke - it was a truck engine. I know they made marine versions that were about 200HP. You could also port and polish the head and if it is FW cooled you could go to a good aluminum intake manifold. A good roller cam in all that and you would be up well north of 200HP. It would be a project for sure.