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Re: GMC with 478 V-6
My '62 GMC 6500 with a 478 got roughly 7 to 9.
My '66 GMC Pick-Up with a 305 got a surprising 15 1/2 Hi-way after a super tune.
I too have my doubts on 14 to 15 for a 478.
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'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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