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03-20-2005, 05:07 PM
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#51 |
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Registered User
Join Date: Oct 2004
Location: Cincy, OH
Posts: 190
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I'm guessing on my 71 bored 30 over, cam'd, other preformance acc.'s old 3 speed, and a stock 3.07 gear ratio I get about 12 in town
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'71 GMC 350 bored, cam'd, straight pipes     LOOKING FOR A 4x4  redz 1970 K5 "Time has stopped for our classic trucks, and as such maintain nostalgia and simplicity of the vehicles and of an era passed." |
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03-20-2005, 11:55 PM
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#52 |
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Registered User
 Join Date: Dec 1999
Location: Modesto, CA
Posts: 565
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took it for its first road trip since the drivetrain restoration this weekend and got 12mpg through the 4 days. fuel injected, 350/350 with a 3.08 rear end
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Current owner of 2016 2500 Silverado Midnight Edition. Former owner of: 69 1/2 ton, change from long/fleet to short/fleet, shaved door handles, shaved tailgate, 4/6 drop, power windows, 700r4 72 blazer, 350 with Holley Commander 950 DFI, crane energizer cam, 350 tranny, dual sanderson blockhuggers/magnaflow exhaust |
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03-21-2005, 07:30 AM
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#53 |
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Registered User
Join Date: Jun 2002
Location: central pa
Posts: 1,525
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My old 402/th400/qjet/crane hmv-272 cam/4.1 rear/9.50x16.5 bias would get 10.5mpg around home and 13.5mpg highway@55mph, 3200lb slidein camper it would get 8.5-9.5mpg highway no head wind.
Since the rebuild same cam/engine combo but a new edelbrock 1411 carb and HEI, best sofar was 11mpg, average around home 9.5mpg, towing a 5500lb travel trailer around home 6.75mpg. Thinking of going back to the QJET.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne |
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03-21-2005, 10:44 AM
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#54 |
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Registered User
Join Date: Jan 2003
Location: Seattle WA
Posts: 1,466
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Probbaly no better than 5mpg.
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FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection |
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03-21-2005, 11:34 AM
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#55 |
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PROJECT 7DEUCE
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,608
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About 12 with a crate 350 th350 and 3:73 gears..
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GO BIG GREEN GO DUCKSMEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
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03-21-2005, 03:35 PM
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#56 |
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Registered User
Join Date: Feb 2004
Location: Northern Black Hills, SD
Posts: 38
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'69 K20, 350/265 Hi-Torque + Q-jet + stock ramshorns w/ dual exhaust + 33" tires + SM465 4-speed + 4:55's = 11mpg
Hence, the 50 gallon auxillary tank in the bed . . .
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1969 Chevy K20 Fleetside 1979 Chevy K10 "ROBAHOR" (Rusted Out Beyond All Hope Of Repair) Last edited by wyoman64; 03-21-2005 at 03:39 PM. |
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03-21-2005, 06:01 PM
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#57 |
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Beer Power!!!!!!!!!!
Join Date: Nov 2003
Location: Nacogdoches, TX
Posts: 280
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On our recent trip to Boykin Springs Park, about 64 miles each way, the truck got there on a quarter tank and we returned on another quarter. 128 miles on half a tank of gas, or I guess about 7.5 gallons of gas. 128 divided by 7.5 equals around 17.06 miles per gallon. The truck is totally stock from factory, 307 V-8, 2bbl carb, 3 speed column shift and no air. I was running 4 brand new tires and just had an alignment done as well.
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Rather be fishin' |
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