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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | Joined: Dec 2018 Posts: 10 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 10 | I have a 1951 gmc 3/4 ton pickup with a 228 6 cylinder. what should I do about gas type. Is regular gas ok or do i need an additive? If so what .
At present I am using MO gas (aviation gas with no ethanol). thank you | | | | | Joined: Mar 2010 Posts: 10,272 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,272 | I run 87 octane. It works very well.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | No ethanol is best but that comment usually starts a big debate. It’s been beat to death on the site. Do a Stovebolt search and be prepared for an evenings reading.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Jan 2002 Posts: 2,839 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,839 | I run 87 octane. It works very well. Me too, running a '63 235 in my truck.
Craig My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.
| | | | | Joined: Jul 2000 Posts: 2,190 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,190 | 87 octane gas (10% ethanol) purchased August 18. Drove it today - idled a bit rough - needed a bit more choke but it ran OK.
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Apr 2005 Posts: 61 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 61 | My ‘46 gmc with its 228 likes 89 octane, NO ethanol gas. I drive a few miles into south Central PA to find it. For your area, check out pure gas.com
Ethanol is a bad deal on many fronts, but once you dump it in your antique motor vehicle, nothing good happens. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Octane was way below 87 or 85 when our trucks were new. Whatever the lowest grade at the pump is adequate, anything. Higher is just a waste of money. No alcohol is best, 100 low lead adds more lead than we need, probably not legal if anyone is looking. 80 octane avgas, if one can find it, is OK.
NO alcohol is best.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Sep 2011 Posts: 1,453 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,453 | Running on ethanol blend & leaving a rig to set with in in the system very different. The only non-ethanol you can by in Oregon premium / high octane so I run the 87 E10 but purge & put non ethanol in for the winter when rigs will only be run a few times.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Dec 2014 Posts: 678 'Bolter | | 'Bolter Joined: Dec 2014 Posts: 678 | Ethanol is hydrophilic - attracts water from the atmosphere - and shouldn't be used in vehicles that sit for prolonged periods. This is why ethanol gas is not allowed for use in aircraft. Here is a list of non-ethanol fuel sources state-by-state: https://www.pure-gas.org/index.jsp
1951 Chevy Panel Truck
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