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Okay so I have a 1994 Chevy k1500 with the 4.3 tbi and I have a second motor that is a 94 5.7 tbi what all do I need to get to do the swap.
obviously motor mounts but what else?
 

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‘01 Silverado 2500HD 8.1/Allison 5sp xcab long bed
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Fan shroud for the 5.7. Radiator hoses, computer chip for the 5.7, assuming the 5.7 came from a truck with the same type transmission.

The fuel lines will have to be mildly relocated around the distributor.
 
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Plus, if you want a higher stall TC use the 4.3L one. If not, go with the 5.7L. I'm guessing you have the 5.7L injectors too?
 
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