Re: GMC JE 9500's with a 637 Gas
Bob,
Appreciate the explanation on some of the internal differences. My first indication of that was how it sounded and how it performed in comparison to the 478, which we also had in our small fleet. The 478 had tons of torque and drove a lot like a 237 Mack where the 637 was a "Rev-er" more like a Detroit.
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'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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