Repower problem

brendanstl · May 6, 2010

I bought a boat from a guy that "forgot" to winterize his boat and got it for a great deal knowing I would need a new motor. I bought a running 350 from a 1995 chevy van, brought the motor home today and started tearing it down to install all my parts from the old motor that were still good, before I decided to pull the crank and pistons I thought I would check casting numbers, the crank, rods and pistons all have the same numbers so that saved me some work. I just thought about something though, I think I read somewhere that you cant use your pre vortec manifold with vortec heads, is this true and if so is it possible to find a reasonably priced manifold that will work?

bomar76 · May 6, 2010

Re: Repower problem

The bolt pattern on Votec intakes are different.

I run an aluminum Professional Products (Edelbrock Clone) polished air gap dual plane intake.
If you boat in fresh water they are a fairly inexpensive option.

They are made in different styles to fit vortec/non vortec heads.

brendanstl · May 6, 2010

Re: Repower problem

bomar76 said:
The bolt pattern on Votec intakes are different.

I run an aluminum Professional Products (Edelbrock Clone) polished air gap dual plane intake.
If you boat in fresh water they are a fairly inexpensive option.

They are made in different styles to fit vortec/non vortec heads.

Ok, next question then.... Will I be able to use the cam that was in the 89 350 mag with the vortec heads and will the 350 mag fuel pump work?

180shabah · May 6, 2010

Re: Repower problem

just keep the cam that is already in the van engine.

bomar76 · May 6, 2010

Re: Repower problem

Cam yes.
Fuel pump....that block may not have a fully machined fuel pump boss. Passenger vehicles of that era were all fuel injected and used electric fuel pumps.You will need to look and verify if it is drilled all the way to the cam lobe.
And no, you can't realistically drill it out and finish it on your own.
You can retrofit a MARINE electric fuel pump of correct pressure with an oil pressure switch.

brendanstl · May 6, 2010

Re: Repower problem

180shabah said:
just keep the cam that is already in the van engine.

Too late for that, threw all the lifters and the cam in the dumpster and it was emptied earlier. I have the cam from the old merc motor because it had very low hours on it and labeled all the lifters to go with it.

brendanstl · May 6, 2010

Re: Repower problem

Bomar, will my old carburator work on that manifold.

bomar76 · May 6, 2010

Re: Repower problem

They sell those manifolds in both square bore (Weber/Weber clones/most Hollys) and spread bore (Quadrajunk) patterns.

brendanstl · May 6, 2010

Re: Repower problem

bomar76 said:
They sell those manifolds in both square bore (Weber/Weber clones/most Hollys) and spread bore (Quadrajunk) patterns.

Bomar I appreciate all the great answers from you and all the other members here, I know car motors but when it comes to boats and fuel injected engines I don't know anything..... Do you know what kind of carburetor they put on the 89 350 mags, looks like a quadrajet configuration to me but I'm not sure.

180shabah · May 6, 2010

Re: Repower problem

post the pn from the carb, or snap a quick pic.

brendanstl · May 6, 2010

Re: Repower problem

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Repower problem

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