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Rebuilting a 470

"Merc used a 4BBL carb on some

"Merc used a 4BBL carb on some versions of the 470 in its later years for a few extra horses. If your 470 needs a rebuild and you want more horsepower, I would consider a more modern V6.There are other posts about this conversion, do a search.
Chris"
 
"Considering all the problems

"Considering all the problems with 470's that have surfaced on this site over the last few months, I would sure consider a 4.3 V-6 as Chris suggests.
The 4.3 can get you up to 220 hp or more.
Check your boat's max rated hp, and engine compartment dimensions for fit.
The 4.3 will likely bolt up to the transom inner plate mounting lugs just fine, depending on the year. You will need a Y exhaust collector pipe.
You will likely need to change out the drive upper gear housing to a 1.62 or 1.84 ratio.
Rod"
 
The standard outdrive ratio fo

The standard outdrive ratio for the 470 is 1.84
There is a good chance that is what you have! The V6 will be heavier but that will be offset by the extra ponies(HP) under the cover.
Chris
 
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