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04-09-2019, 06:19 AM
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#1 |
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Registered User
Join Date: Sep 2013
Location: North Tonawanda, NY
Posts: 236
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Gas Choice for 1972 GMC - Original Engine
What type of gas should I be running in my 1972 GMC BB 402ci? The best I know the engine has never been rebuilt and is all original, still running strong at 99,000 miles. Octane? Lead or No Lead?
Thanks! |
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04-09-2019, 08:28 AM
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#2 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,318
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Re: Gas Choice for 1972 GMC - Original Engine
That is a low compression engine. Some where in the 8:1 range. 87 octane unleaded should be fine.
Who sells leaded gas where you live??? |
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04-09-2019, 08:29 AM
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#3 |
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Registered User
Join Date: Apr 2006
Location: Spring, Texas
Posts: 167
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Re: Gas Choice for 1972 GMC - Original Engine
It will run on any grade you put in it.
No need for lead.
__________________
'72 3/4 Cheyenne Super 402/TH400 Gear Vendors '72 3/4 Cheyenne Super 350/200R4 '50 1/2 Chevy 3 Window |
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04-09-2019, 08:59 AM
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#4 | |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,342
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Re: Gas Choice for 1972 GMC - Original Engine
Quote:
I use high test in all my old cars . Not so much for the octane but it's the only non ethanol gas available
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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04-09-2019, 09:01 AM
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#5 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Gas Choice for 1972 GMC - Original Engine
Less ethanol would be good for the fuel system, otherwise it'll burn near anything and has no special octane requirements.
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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04-09-2019, 10:08 AM
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#6 |
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Senior Member
 
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,857
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Re: Gas Choice for 1972 GMC - Original Engine
Non-ethanol gas would be best (primarily for the fuel system components) but you can run regular octane. If you find leaded gas, I wouldn't use it, as it's been banned since 1996 - that would be some pretty old gas you'd be putting in your tank.
__________________
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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