Swap options for 91 pre Vortec 4.3L V6

[drun_trucker]

I found that I have a cracked block.

With that said, I am now on the hunt for a new motor. I have mine down to a long block and is ready to be removed from the boat.

I have found what seems to be a viable replacement except the potential replacement is 3 years newer.

My current (junk) engine is 1991 4.3L Pre Vortec Alpha 1 Gen 1, my question is can I put in a 1994 4.3L Vortec Alpha 1 Gen II.

The 1994 is a complete drop in ready unit. Will the replacement bolt directly to the bell housing of the old motor?

Thoughts, suggestions or recommendations please.

 

[Scott Danforth]

Unbolt the 91, bolt in the 94. Vortec motors came out in 96

 

[DeepBlue2010]

1994 vortec?! Check again with the seller

 

[Bondo]

My current (junk) engine is 1991 4.3L Pre Vortec Alpha 1 Gen 1, my question is can I put in a 1994 4.3L Vortec Alpha 1 Gen II.

Ayuh,.... Should be plug, 'n play,.... may need an electric furl pump,....

The "Vortec" name came out before the heads that wear that name did, by a couple years,....

 

[Rick Stephens]

If you want to be certain whether it has Vortec heads or not you can count the intake bolts. Pre Vortec heads had 6 bolts per side. Vortec heads had 4 bolts per side holding the intake on. I believe the '94 block closed off the mechanical fuel pump access hole, so you'll need to go electric.

I just went through this and purchased the mercruiser fuel pump bracket and o-rings to mount an OEM E1103 Airtex electric fuel pump. Very simple and neat install and a better choice than many automotive electric fuel pumps. Even got what I thought was a pretty good deal on the pump. http://www.amazon.com/gp/product/B0076D5NCO?psc=1

Rick

 

[Volphin]

The true Vortec heads are worth trying to find and install if you don't have them.

 

[Rick Stephens]

The true Vortec heads are worth trying to find and install if you don't have them.

Indeed. Mine are marked 'S-10' on the ends from a junk yard. A set of heads and an Edelbrock Performa intake you get a pretty good boost in HP. I believe you have to change pushrods as well.

Rick

 

[Volphin]

I think I paid $50 for a pair! LOL