speedboatr

Anyone every build up a Vortec 4.3?

BUIZILLA

hopefully someone has... great topic..

Pliant

Well what can be done with a 350 can be done to a 4.3..Its the avaibilty of vortec heads to the v6 that sets it all up..But v6 parts are limited and expensive..

Now with that said you can supercharge or turbo them very cost effectively...They can reliably take 18-25Lbs of boost ..thats 300-350hp..mabye 2000....

Then again you can buy a 350 crate engine for 2500 doing 300

ezstriper

GM performance parts has tons of stuff for them....now cost ?? 350-383 easy swap !

BUIZILLA

is it a balance shaft engine?

JeremyAnderson

Brodix makes a real nice aluminum cylinder head in a big and smaller port version. it has a non vortec intake flange, so you can use a Edelbrock intake.

fkboatman

build it, build it. great motor to build. just do one without balance shaft. is it a m block or s block

speedboatr

The motor is a 1997 Volvo. It is out of a 19’ Scarab Jet. I have pulled the motor and it goes to the machine shop tomorrow so they can check to see what damage has been done.
I believe the motor is a balance shaft motor. Not sure about the “s” or “m”.
I purchased the boat as a project boat. The motor had no intake or carb. And one of the heads (along with a lot of parts) in a basket. Looks like it had blew a head gasket. Anyone know if these motors have a rev limiter? With it being a jet I would guess that it could be easy to cavitate and over rev the motor.

JeremyAnderson

with the Brodix heads, a mild hydraulic roller cam (212*/218* @ .050), Performer intake and 4bbl it will make 325 hp.

jeffswav

This has been covered before. You are limited on your cam choices. The v6 is more prone to reversion unless you used dry exhaust. Also there are more aftermarket parts available for for SBC/BBC. Cost is not much different than building a SBC. I am sure you will hear many opinions for and against building one.