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Repowering the boat.... Need help with ratio.

Jeff8330

Member
Well, my 1981 sea ray sedan bridge has two opposite rotation mercruiser 330s (454s) in it now. They're pretty much done for.i am repowering it with a set of standard (LH) spinning 2003 crusader mpi motors. They'll be more than adequate. My question is my current trans' are velvet drives (72c's) I know I can't run these in the opposite direction. Anyway, even if I could, that's irrelevant to this post. So I'm going to go with hurths. The velvet drives in my boat are 1.52.1. What am I going to need to run with the small blocks??? Here's the skinny on my boat.

81 sedan bridge.
2.25" shafts
12,000 lbs
Not sure on the props
Any help would be appreciated. I understand gear ratios in cars real well. But not so much when it comes to marine transmissions. Thank in advance.
 
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