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the 91 454 tonawanda number is XXXXX an the other is a 89 but i dont know the number on it. so there aint no difference between them other then the companys. there just factory fuel injected
I got this from Chilton's 1991 Chevrolet K3500.
Oops, I uploaded the wrong diagram.
need help on a 1999 Chevy K3500 pickup with a 7.4 L