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1991 GMC C3500 Engine swap nightmare Help

I am doing the exact same engine swap. I replaced the tork converter with a 454 type into my 1991 GMC C3500, I am using the original wiring harness and the 350 & computer with a towmaster chip for the 454 installed. The 1991 wiring will not support the 454 TBI 1994 computer or electronic EGR or...
- surplusdoctor
- Post #2
- Oct 4, 2012
- Forum: Engine Performance + Maintenance
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1991 GMC 7.4L intake Manifold EGR

I was looking for a edelbrock intake for a truck project i am working on. I was told that because of the EGR being different on the 91 and later 454, the edelbrock intakes stopped for year 1990. Can any one elaborate as to what manifolds are available for a Gen V 1991 7.4L. and what EGR they use?
- surplusdoctor
- Thread
- Jun 24, 2012
- Replies: 0
- Forum: Engine Performance + Maintenance
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1991 GMC C3500 Engine swap nightmare Help

I have a 1991 GMC Cab and chassis c3500 that had a tired 350 and a good 4L80E in it. I pulled out the 350 and set in a new 454 tourque converter and bolted up a machine shop remanufactured 454 from a 1994 c3500. After I set it in I noticed the 350 TBI wiring harness will not support the...
- surplusdoctor
- Thread
- Jun 23, 2012
- Replies: 9
- Forum: Engine Performance + Maintenance