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Yes you can, But you will have to replace the fuel pump. The 91 fuel pump pressure is
9 to 13 LBS. Required pressure for the vortec to make it run is 55 to 62 LBS. of pressure. The next thing you will have to change to make it run is the compleate wireing harness so you can use the 1996 powertrain control module ( PCM ). You will have to use all of the ignition parts that belong on the vortec engine. Every device that came on the vortec engine must be on it to make it run.
The next problem is the 700R4 Transmission that is in the truck now needs the 91 PCM computer to work. Remember you changed it to the 1996 PCM so the engine will run. In other words you will now need the 1996 Transmission. 4L60 or 4L80E trans.
Depending on if the 96 was a 1/2 ton are a 3/4 ton. That will make a difference in what transmission you will need so the 1996 computer- PCM will shift the Transmission correctly.
The GOVERMENT does not want us modifying anything anymore. And that is why you will need everything that it took to make the 96 engine run.
Good luck, I would like to know how it works out for you. NEUTZ.
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∙ 12y ago
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