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03-22-2008, 01:57 AM
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#1 |
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Registered User
Join Date: Jun 2007
Location: northeast pa
Posts: 30
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gas milage
i replaced my plugs, wirers, distributor,air cleaners, fuel filters and rebuilt the carb. i have a 1968 straight 6 253. afterchecking the milage today it was only 8 mpg can this be right?
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03-22-2008, 02:00 AM
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#2 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: gas milage
It's possible but to really tell we will need more info.What tranny?What gear ratio?What tire?1/2 or 3/4 ton?Loaded or not? If you give more details some of the members here may be able to give you some ideas.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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03-22-2008, 02:27 AM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: gas milage
is 258 a typo? What was that out of?
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03-22-2008, 02:30 AM
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#4 |
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Just loves his truck.
Join Date: Jan 2008
Location: cleburne, TX
Posts: 263
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Re: gas milage
i have a friend who has a f*** with a strait 6 with a 1barl carb and he was getting 20 with a 3 on the tree
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 Gold 1969 c10 LWB--350 gm crate motor 30"muds on the back...with aluminum rims with black and red Chevy bowtie center caps that look awesome! EAGLE SCOUT FTW!!! |
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03-22-2008, 05:06 AM
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#5 |
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Tire goomba extrordianaire
Join Date: Mar 2008
Location: Boiling Springs, PA USA
Posts: 132
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Re: gas milage
My father's '78 could get 20mpg with a 250 and TotT, but it had a 2.73 rearend. Something GM did to bump cafe. I'm wondering the same thing about the 253 as well, longhorn man
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03-22-2008, 06:58 AM
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#6 | |
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Registered User
Join Date: May 2007
Location: Moore, Oklahoma
Posts: 2,396
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Re: gas milage
Quote:
Does it even run right? 8 mpg is the type of mileage you get if you have criss crossed plug wires and the dizzy a tooth off and stuff like that
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Are you retired too? Nonsense! I'm in my prime |
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03-22-2008, 08:18 AM
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#7 |
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Senior Member
 
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,865
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Re: gas milage
If it's .030 over then it would be about 253.7 if I have the bore and stroke correct at (standard) 3.875 x 3.53. Maybe that's what he meant.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent. |
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03-22-2008, 09:13 AM
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#8 |
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Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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Re: gas milage
When checking mileage, use a GPS unit on flat ground. It'll give a false reading if there are lot's of hills.
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1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten... |
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03-22-2008, 09:17 AM
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#9 |
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Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: gas milage
[QUOTE=WorkinLonghorn;2638570]If it's .030 over then it would be about 253.7 if I have the bore and stroke correct at (standard) 3.875 x 3.53. Maybe that's what he meant.
Maybe. Maybe not. That's sure giving him the benefit of the doubt.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD  Click here to support the board Philippians 4: 6-7 Last edited by dan42; 03-22-2008 at 09:18 AM. |
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03-25-2008, 07:52 AM
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#10 |
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Registered User
Join Date: Jun 2007
Location: northeast pa
Posts: 30
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Re: gas milage
Maybe I took the milage wrong I'm checking it again.
I'll get the other info this week i got the GM info and i think it is inside of the clove box It runs great my mechanic went thru all of it. he found out and fixed some things and let me know what did wrong. could I be letting it high idle to long I let idle about a minute or two and go. if it's cold out I push it in a little bit at a time. until it stops chocking when I start off. thanks for your help |
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03-25-2008, 12:02 PM
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#11 |
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knuckle buster..
Join Date: Oct 2007
Location: Frisco
Posts: 613
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Re: gas milage
8mpg sounds really good! i get 6mpg with a freshly rebuilt 327, 373 gears and an auto 350 with 91 octane plus 108 octane boost. thats usually downhill in neutral. am i doing something wrong?
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