I have a 91 blazer with a 4.3 that is bad. I have a 96-98 vortec v6, will it work in my truck? What do I have to swap besides the intake if anything else? Thanks for any help!!

 

Shawn, welcome to the forum. The vortec has a balance shaft and the 91 does not. Meaning the old intake will not bolt onto the new motor.

I put a 97 vortec into my 91 5 speed. Modifying the wiring harnesses and adding fuses took twice as long as I thought it would. You will need the engine wiring harness and pcm plus the maf sensor and intake plumbing. The front accessories from the old will work if you block off the egr and make a bracket for the alternator. Add 3 oxygen sensors and coolant plumbing with the 91 temp sensor so the gauge works. The list of modifications is worse than a nightmare, but not quite hell on earth.

I was happy when it was done but I won't go through that again for a v-6. I would trade the good new motor for a good old style. Or keep the new motor and find a new blazer with a bad motor for cheap.

 

Could I use the new block if I used the heads and intake off the other engine? I heard something about the oil pan not fitting also.

 

I understand. Giving up my 91 was not an option either. When I researched my swap it was easier to make the vortec run correctly than it would have been to castrate it with my old 91 parts.

 

I just found an old 283 w/points, and condenser and carb. can It work in my 91 s10 blazer?

 

Look up V8 swap in s10 on google. I believe there is a whole forum dedicated to that swap.