Good choice on the TBI 4.3, I had one in my old pickup, and they are pretty stout. As far as wiring, if you had a TBI 2.8, the wiring should be very very similar, if not the same. The harnesses aren't too complicated, btw. As far as tuning, I don't believe you need to switch ECMs completely, but rather the PROM chip. You can get a custom tune from PCM for less for about $80 if I remember correctly. I'm running a tune from them in my camaro and it gets the job done. As far as your fuel system, you probably wouldn't have to make any changes. TBI systems don't use very much fuel pressure, and as long as you are staying with your in-tank TBI pump you'll be alright.

One thing though, does your blazer have a cable driven or electic speedometer? The '91 should have an electric speedometer. There is an adapter which you would need if you have a cable speedo. I bought mine on ebay from TPI parts I believe, but let me know if you need help finding it.

As far as bolting the motor in, i'm not sure what differences there will be. Motor mounts will be a must at least

For more power, you should be able to pick up a little over stock should you get a tune, also, cam swaps are possible, along with roller rockers, intake manifold, headers, it all depends on how far you want to go with it. You could always swap the stock stuff in and go back later should you want more power

 

i believe its cable driven... how does the electric speedometer work?

 

There is a sensor in the side of the transmission called the Vehicle Speed Sensor or VSS. It generates voltage when rotating which is sent to the ECM. The ECM then powers a small electric motor in the speedometer which will indicate speed and work the odometer. You can check this quickly by looking at the drivers side of the transmission towards the back. Either you will have a cable or a sensor with a connector on it.

 

Well my friend... i just purchased a 89 s-10 pickup with a 4.3 ltr automatic. 166000 miles on dial... needs a clean up... now for my next question... alright i got into a little fender bender in my blazer i in need of 2 fenders and maybe a radiator support dont know yet... welll some how some way it messed with my truck it now wont run correctly my fuel injectors are spittin no fuel yet fuel is runnin through the lines... my ecmII fuse keeps blowin out... any possible ideas why this is occuring???

 

what does a smog pump really do? how does it work and is it really necessary i know its necessary to pass inspection...

 

hey would vortec heads fit on a 89 4.3 v6? would there b any difference

 

I was doing some research on that a while back. I'm assuming you are talking about the newer style vortec heads. The heads bolt up, but they have a totally different intake bolt pattern. So you would have to run it with the newer style intake and electronics. At that point you would be better off with a newer style complete engine.

The heads you've got are known for flowing pretty poorly. Some mild porting would help out, but even the newer style heads don't flow that great. For your information, they are known as vortec heads also, but they are just different. I believe what you've got made 160 hp new while the most a naturally aspirated 4.3 made new was 195.

 

Shock Question

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Hey guys I have an 86' s-10 blazer that I lowered 3 inches all the away around. My question now is I need to find a shock that will fit my blazer that is shorter so it wont slam (shock wont hit inside). Off of what caror truck could I get a shorter shock from?