4.3 Vortec

[SawDust{RM}]

For several reasons & a good one from Bond-O, Instead of rebuilding with new heads & intake, I'm going to install a new 2010 Engine with a 4 bbl Rochester, which is rated @ 220-235 hp
I have a Merc outdrive of 1:84 which is on 175-195 hp setups.
My question is should I be looking for a 1:64/1:61 outdrive that is on the 5.0L that turn 220 hp instead of the 1:81
etc,etc,etc...

 

[Bifflefan]

Re: 4.3 Vortec

I dont think I would change the drive unless you have one laying around. You can prop out of the small bit of ratio. And as a bonus, alot of people buy really nice props that are to big (to much pitch) for their boat and thus they sell them cheap.
I would use what you have then see what happens, you can correct from there is needed.

 

[Bondo]

Re: 4.3 Vortec

I'm going to install a new 2010 Engine with a 4 bbl Rochester,

Ayuh,... Rochester,..?? that carb ain't been used in years, 'n Years...

Merc uses the Merc/ Weber/ Edlebrock AFB Carter clone carbs....

My early 90s 4.3l, weber carbed is runnin' the ole 1.65:1 ratio...
About 20"s of pitch is right for My boat/ motor/ drive combo...