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08-30-2023, 02:09 PM
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#1 |
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Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 311
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Octane
What octane are you using and why? Stock motors only please. Remember these pumps? You just put the slider on the octane you wanted. A little ping try the next one up. I remember buying gas on these. Bought a dimes worth to get home with my 348 and 3 two barrels. Times were tough!
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08-30-2023, 03:00 PM
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#2 |
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Registered User
 
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 2,974
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Re: Octane
Reminds me of this pump at a station I stopped at, had never seen 1/2 octane values.
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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08-30-2023, 03:16 PM
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#3 |
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Registered User
Join Date: Aug 2010
Location: central oregon
Posts: 148
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Re: Octane
hi guys, 87 octane. gm goodwrench crate engine, were rated at 8.5 comp but were more like 8.0 comp or less. works perfect. chuck
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08-30-2023, 03:29 PM
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#4 |
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Active Member
Join Date: May 2016
Location: Madison WI
Posts: 145
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Re: Octane
I run 91 no Ethanol, listed here as "recreational" gasoline. 1980's 454
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08-30-2023, 04:30 PM
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#5 |
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Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 1,945
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Re: Octane
I run non-Ethanol 91 octane in all my hot rods and small engines. My hot rods go in the shed mid-October? and they don't come out until April. Never had a problem starting them in the spring. But keep in mind we don't put a lot miles on them so the extra cost for 91 octane
is minimal. |
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08-30-2023, 04:57 PM
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#6 |
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Senior Member
Join Date: Apr 2013
Location: Podunk, Texas
Posts: 741
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Re: Octane
1967 GMC 250 L6…owner’s manual recommends regular gasoline (which was about 94 octane back then and of course leaded)…I use non-alcoholic gasoline which around here is typically 92-94 octane…it’s expensive, but my truck isn’t a daily driver and my hearing probably isn’t good enough to hear the engine pinging if the octane is 87-89, (if indeed pinging occurs….)
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"It is hard to search for a black cat in a dark room, particularly if it is not there. Especially if this cat is smart, brave, and polite." Sergei Shoigu, Russian Minister of Defense |
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08-30-2023, 04:58 PM
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#7 |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,087
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Re: Octane
When I was building up a 292 for my '68 C/10 Stepside, the Machinist asked what compression I wanted. 8 to 1, I said, so I can use the cheapest pump gas available. I think he was used to most of his Hot Rod/Racing customers wanting higher compressions.
I had a 454 BBC in my '67 K/10 Suburban. It required 91 octane, and a lot of it. Chevron Regular [87] ran OK, but other brands had to be Supreme. I was running the Mr Goodwrench 350 in my '71 GMC Jimmy on 91 octane for years, until last year, when Regular jumped up to $5/Gallon. Then I put it on an 87 octane diet. After a carb adjust, it runs fine on Regular.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 09-01-2023 at 06:51 PM. |
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08-30-2023, 10:31 PM
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#8 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,523
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Re: Octane
My stock (rebuilt) 350 is happy with 87 octane.... as long as you give it plenty of the stuff.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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08-31-2023, 09:53 AM
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#9 |
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Registered User
Join Date: Jul 2019
Location: Beebe, AR
Posts: 2,433
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Re: Octane
I run non-ethanol in my truck and get either 87 or 91 octane, depends upon the station. Closest has only 91 with no corn but one a bit further out I can get 87 without ethanol.
Runs fine on both but the 87 is a little less costly. Mine is not a daily driver either so I don't mind paying up for the non corn version.
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1967 C10 1980 Jeep CJ5 2020 Toyota 4Runner 2020 Toyota CH-R 2020 Acura MDX |
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08-31-2023, 11:22 AM
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#10 |
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All stock and staying that way
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,341
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Re: Octane
Back when my 70 Blazer was a daily driver, I would run 89 octane and it never complained. When I get it back in operation, I will use the 90 octane Rec fuel IF it's still available.
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress...  1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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08-31-2023, 11:55 AM
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#11 |
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Senior Member
Join Date: Mar 2019
Location: Herculaneum MO (20 minutes south of St. Louis
Posts: 592
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Re: Octane
87 Octane refilled every two days. No way I could afford 91 octane. No complaints from either one of my trucks.
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67 C10 283 T5 swapped longbed fleetside = wife's daily driver 67 C20 292 (originally a 250)4speed longbed fleetside w/original wooden bed=my project truck 67 C10 283+.060 (so a 292 as well)T5 swapped longbed fleetside=my DD 72 C1500 Sierra Grande 350 TH350 longbed fleetside=wife's fair weather truck Can you tell we are fans of longbed fleetsides & 67s Chris |
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09-01-2023, 04:31 PM
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#12 |
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Registered User
Join Date: Dec 2001
Location: harvard, il. USA
Posts: 389
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Re: Octane
Wife' car = 68 Chevelle, stock 327 w/HEI. Runs fine on 87 pump gas.
My truck = 70 GMC, stock 396 w/HEI. Runs fine w/the same. Actually, all my toys run on the same until hibernation. Then they get non-alcohol, usually 93, w/2x seafoam package directions. YMMV...Don. |
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09-01-2023, 06:20 PM
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#13 |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,822
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Re: Octane
My Blazer has an L31 running right around 9.7:1 compression, Quadrajet, and Progression Ignition HEI distributor. I run 87 octane in it.
I have two Z/28s and they get premium.
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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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09-01-2023, 07:12 PM
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#14 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,147
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Re: Octane
My truck tolerates 87 for normal use, but I put premium in it when towing. Now that I don't use it for towing, I'll start using 87 all the time.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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