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Old January 27th, 2019, 04:09 AM
BillT BillT is offline
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Join Date: Jan 2013
Location: Moneta, VA
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Default Re: Terrible gas mileage,

Glad to see your mileage improve. After a super-tune on my '66 305, I got 15 1/2 Hi-way.

Even though many like Holley's I had no problems with my original. I would always adjust it to the Highest Vacuum that I could get out of it. Also what kind of Muffler are you running? V-6's love to breathe. I always ran a Straight-Thru on mine.
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Drove and owned many, but some of the more interesting ones were:

-'60 GMC 2500 Dump, 305 V-6
-'62 GMC 4000 Flatbed, 305 V-6
-'62 GMC 6500 Flatbed Dump, 478 V-6
-'67 GMC 7500 Box, 6V-53 Detroit
-'71 GMC 9500 Flatbed Dump, 637 V-8
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