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04-24-2011, 10:00 PM
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#1 |
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Registered User
 Join Date: Apr 2011
Location: El Paso TX
Posts: 58
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1966 GMC 3/4 gas mileage question
newb question here.
i'm looking into a 66 GMC 3/4 ton with a 350 engine, 700 automatic transmission. about how many mp/gallon should i expect in the city? Last edited by chimney chop; 04-24-2011 at 10:00 PM. |
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04-24-2011, 10:54 PM
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#2 |
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Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: 1966 GMC 3/4 gas mileage question
depends on rear gears, in the city you may not be hitting the OD either//
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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04-24-2011, 11:33 PM
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#3 |
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Registered User
Join Date: May 2005
Location: Beaverton, OR
Posts: 3,728
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Re: 1966 GMC 3/4 gas mileage question
How is the motor built? My C20 has a 327 and gets about 7mpg. I have an Edelbrock intake and carb with HEI I hope to install next week in hopes to improve mileage.
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New Project: 1966 LWB C20 Plans: 1/2 ton conversion Dropmember front Dropmember rear Corvette discs Restored raised bed http://67-72chevytrucks.com/vboard/s....php?p=4295210 |
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04-25-2011, 12:03 AM
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#4 |
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60-66 Nut
 Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,250
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Re: 1966 GMC 3/4 gas mileage question
My '66 C20 used to get about 10 mpg. That was with a 327, 600 Holley, HEI, headers, etc. SM420 and 4.57 rear gears and 9.50x 16.5 tires. So depending on how that 350 is built and tuned, I would think that 14-16 should be doable. Of course there are other factors involved such as rear gears and tire size.
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