Do you already have the 350? If not you should LS swap without doubt.

 

I already have the 350 and I want to stay with it. I’m looking to just swap the 5.7 into the 4.3 engine bay. I actually have the entire running driving truck that the 5.7 is still in. It’s a newly rebuilt 5.7 too.

 

Just swap as much as you can, the motor mounts are direct bolt on. You'll need exhaust, ecm, as much of the wiring harness as you can. Transmissions will bolt up without a problem. It should be the easier end of the scale as far as swaps go..

If you need any wiring help Gearhead-efi.com has all of the wiring diagrams you will need.

 

Maybe I’m not explaining myself. They are basically the exact same truck. Even the wiring is the same. I think all I need is the computer out of the 90 and pull the fully assembled 5.7 engine and place it into the 4.3 engine bay. But I’m just making sure I’m not missing anything.

 

I can't think of anything you are missing, the TBI motors are pretty simple. As long as both vehicles use the same ECM then you won't have any problem swapping them.

It sounds like you have everything you need. If you run into any problems (which I doubt) then I'll see if I can help.

 

I can't think of anything you are missing, the TBI motors are pretty simple. As long as both vehicles use the same ECM then you won't have any problem swapping them.

It sounds like you have everything you need. If you run into any problems (which I doubt) then I'll see if I can help.

I can't think of anything you are missing, the TBI motors are pretty simple. As long as both vehicles use the same ECM then you won't have any problem swapping them.

It sounds like you have everything you need. If you run into any problems (which I doubt) then I'll see if I can help.

Thanks . I’ve been checking into the different sensors and attachments. They all cross over from the 4.3 to the 5.7. Already have a new distributor, coil and other pieces for the 5.7. It’s a running engine still in the truck. So as soon as I have an open week at the shop I’m swapping them out. Then all 4 of my trucks will be 100% finished.

 

So how did the swap go? I’m looking on doing the same swap.