| Octane Used in a GMC 1976 Palm Beach ? [message #181066] |
Tue, 21 August 2012 08:59  |
robertmcw
Messages: 71
Registered: April 2011
Karma: 0
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I am looking at a 1976 Palm Beach. I live in Houston so the gas has ethanol. Where I shop, they have 3 grades of gas, 87, 89 and 93 octane.
1. If I get it, which grade should I use?
2. If we rebuild the motor, can I use the 87 grade?
Thanks, Robert
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| Re: [GMCnet] Octane Used in a GMC 1976 Palm Beach ? [message #181080 is a reply to message #181066] |
Tue, 21 August 2012 10:12  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Robert,
I run the cheapest gas I can find. My only advise is to make certain (that is - replace) all fuel lines and vents are operating. I also have an electric fuel pump that has probably helped save me from vapor lock, but I don’t know for certain. It probably helps to block the crossover ports on the intake manifold too.
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA
On Aug 21, 2012, at 6:59 AM, Robert McWhorter wrote:
> I am looking at a 1976 Palm Beach. I live in Houston so the gas has ethanol. Where I shop, they have 3 grades of gas, 87, 89 and 93 octane.
>
> 1. If I get it, which grade should I use?
>
> 2. If we rebuild the motor, can I use the 87 grade?
>
>
> Thanks, Robert
>
> ______________________________________________
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Octane Used in a GMC 1976 Palm Beach ? [message #181083 is a reply to message #181066] |
Tue, 21 August 2012 10:15 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I use 87 gasohol in mine, which has alcohol proof fuel lines. It will vapor lock, but doesn't knock on it. Engine is box stock 455 with 92K miles on it.
--johnny
'76 23' transmode norris
'76 palm beachy
From: Robert McWhorter <txlawyer@texas.net>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, August 21, 2012 9:59 AM
Subject: [GMCnet] Octane Used in a GMC 1976 Palm Beach ?
I am looking at a 1976 Palm Beach. I live in Houston so the gas has ethanol. Where I shop, they have 3 grades of gas, 87, 89 and 93 octane.
1. If I get it, which grade should I use?
2. If we rebuild the motor, can I use the 87 grade?
Thanks, Robert
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Octane Used in a GMC 1976 Palm Beach ? [message #181255 is a reply to message #181066] |
Wed, 22 August 2012 08:12 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Robert,
You can run crap gas in it as stock, or after a rebuild. Just stick to
8.5:1 pistons and all will be fine.
On Tue, Aug 21, 2012 at 6:59 AM, Robert McWhorter <txlawyer@texas.net>wrote:
>
>
> I am looking at a 1976 Palm Beach. I live in Houston so the gas has
> ethanol. Where I shop, they have 3 grades of gas, 87, 89 and 93 octane.
>
> 1. If I get it, which grade should I use?
>
> 2. If we rebuild the motor, can I use the 87 grade?
>
>
> Thanks, Robert
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Fathom the hypocrisy of a nation where every citizen must prove they have
health insurance......but not everyone has to prove they're a citizen.
Steve Ferguson
Sierra Vista, AZ
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