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#1 |
Registered User
Join Date: Aug 2003
Location: Crawfordsville,Oregon
Posts: 83
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Inline six gas mileage?
I am considering swapping a 250 in place of my worn out 350. Is there a slim chance that gas mileage will be better or will it bite the dust cause the motor will be working harder. I also found a complete 292 good runner for 250 bucks. Is the 292 a better option then the 250?
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#2 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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The 292 is a work truck engine. Very strong. Its virtues are big torque at low RPM, longevity/durability and heat tolerance. It does not turn fast. 4500 -5000 is redline for a stock 292.
The 250 might run faster but I have no experience with them first hand so it would be unfair for me to venture a biased opinion. 292's are a lot of fun. I ran one in my '68 C/10 shortbed stepside with a 4 Bbl Holley, Offy intake, Clifford headers on a .030 bore from '77 to '02. I'm now in the process of finishing a rebuild of the original 292 block and I just picked up an early ('63?) 292 L6 as a parts carcass. You might ask the 250 vs 292 question at: www.inliners.org Hope this helps
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#3 |
Registered User
Join Date: Dec 1999
Location: BRADENTON FLA
Posts: 3,269
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Do you know the 63 292 is the only year with a forged steel crankshaft
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Rest in Peace Ed. Thanks for all the good times. |
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#4 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,855
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I used to get pretty decent mileage out of my 250 inline. ON the highway I got about 19 MPG and about 17 around town. It was backed by a 3 speed manual
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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#5 |
Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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At one point I could get as high as 18mpg in the truck, but that was very rare. Usually it was around 16. I haven't put any time or energy into maintanence and it's getting around 12mpg right now.
The Camaro has gotten up to 25mpg on the highway!
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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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#6 |
Registered User
Join Date: Dec 2002
Location: Canada
Posts: 695
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I wouldn't say that mileage was its strong point but I have had my 292 for a long time and it has been a good motor. I used to have a 250 in a '67 shortbox stepside and I think the 292 is a much better motor. Mostly subjective I guess rather than objective as I can't tell you in detail why. I also have to admit that my 250 was about worn out and the 292 is in better condition. I like the 292 and if you want to be different, an inline is it. There is not as much aftermarket stuff readily available and the stuff that is out there will cost more. If you plan to leave it stock that will not be a problem.
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1968 Chevy - 292 with a powerglide |
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#7 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,915
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I have a 250 in my truck temporarily. I don't think you'd see any improvement in mileage. I get about 14. The 250 just isn't big enough for one of these trucks. It does have one interesting characteristic, though. It sounds like the old UPS truck when I accelerate.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#8 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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'63 L6 292
Quote:
FIII6PG is stamped on the distributor pad. Sorry, I didn't mean to hijack the thread. ![]()
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#9 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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I've had several 250s. They have adequate power, but you sure won't win any races unless you spend a lot of bucks. Talked to a guy with one in a early Nova with dual Holley quads who was turning low 12's.
Milage can vary, anywhere from 15 to 20 mpg, depends on a lot. My best milage was in an 80 van that had the integral head and a progressive 2 bbl carb. The 292 will give more power, lots of torque at the bottom end. I've never owned one, but do have one in the plans for my 52. I would assume that with more cubic inches, the milage will suffer some, but don't know how much.
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#10 |
Registered Cruiser
Join Date: May 2002
Location: Las Vegas NV
Posts: 2,230
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I had a 67 with a 250 in it some years back... It was a lot quicker than my dads 84 which was new at the time... but that ain't sayin' much
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I intend to live forever. So far, so good. |
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#11 |
Registered User
Join Date: Jul 2002
Location: St. James, MO
Posts: 1,239
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My wife a 250 in her '66 Bel Air (w/ a PG). It would run on the highway all day long, but it took all morning to get up to highway speed. Mileage was poor, but I don't remember exact figures.
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'69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt. |
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#12 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Most of the 6's were equipted like a farm truck.3 or 4 speeds and low rear gears.If you run an auto and maybe some decent gearing you could get decent milage.The 6's run much lower RPM's so don't expect much performance.I have a 250-3sp-3.73 and I get about 13-15 but at 65 she's pretty well wound up.I hope to swap to 3.08's and later on maybe a 700R4 or 480L.
I think the uniqueness of the 6 is important if you want to drive something different from a jellybean.
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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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#13 |
Registered User
Join Date: Aug 2003
Location: Crawfordsville,Oregon
Posts: 83
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hmm, still sounds like the 6 gets better mileage then a 350. Even when mine was still in good shape it never did better then 12 mpg. Thats with 3:73 gears and 31 inch tires, auto etc. I bought the 292. The guy was selling it cheap but I tried to knock a few bucks off by commenting on the leaky front seal etc. And he was like give me a hundred and I pull it. Done deal
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#14 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Dwyne, as far as I know there was never a 2 bbl 6 cyl factory offering.You can visit Cliffords performance for a 4bbl intake that uses a 390CFM Holley.That upgrade will probably run around $500.00 new.For around another $250.00 you can get a header.
6cyl. performance ain't as cheap as the 'ole smallblock as you can see. If time is a factor, swap in the complete 6 and hit the swap meets for a manifold and carb. I see a guy here in the Atlanta area that carries a lot of 6 performance stuff but it may be harder to locate where you are. inlinersinternational.com is the place to ask 6 cyl performance questions.Maybe someone over ther will have some used stuff or a better deal.
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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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#15 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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L6/2-Bbl Manifolds
Quote:
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#16 |
student wrench turner
Join Date: Jan 2003
Location: wrightstown, wisconsin
Posts: 192
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In 1980 the straight six with the integral head had a 2 barrel carb on it and it had a dual exhaust manifold.
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1969 Chevy C-10 with 250 L6 2002 GMC Sierra 2500 HD Duramax with banks six gun |
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#17 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,280
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You're right, but my head is still in the late '60s/ early '70s.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 09-01-2003 at 04:58 AM. |
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