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Fuel / gas type for 56 Plymouth
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dludvik76
Posted 2019-03-03 5:16 PM (#578827)
Subject: Fuel / gas type for 56 Plymouth


Member

Posts: 36
25
Hi everyone,

Searching didn't help, but I may have just missed a result. I just bought a 56 Belvedere and before I get too far into this thing I'm wondering if I need to run leaded additive in the fuel or if unleaded is fine. Thanks for the info for anyone who responds.
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Powerflite
Posted 2019-03-03 6:07 PM (#578829 - in reply to #578827)
Subject: Re: Fuel / gas type for 56 Plymouth



Expert 5K+

Posts: 5344
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Location: So. California
Leaded would of course be better, but I can't be bothered with that so I just run unleaded, and when it eventually needs to be rebuilt, I will put in hardened exhaust seats. They will run fine without it for many thousands of miles. Typically, we don't put $150k miles on these cars so you may never need to worry about it.
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westaus29
Posted 2019-03-03 7:49 PM (#578833 - in reply to #578827)
Subject: Re: Fuel / gas type for 56 Plymouth


Regular

Posts: 50
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Location: Mandurah, Western Australia
You can protect your exhaust valves by using lead substitute Flashlube additive to the unleaded fuel, either add 50 ml per tankful or install a dosing unit. You may also need to adjust ignition timing a bit
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local2Ed
Posted 2019-03-03 9:35 PM (#578834 - in reply to #578827)
Subject: Re: Fuel / gas type for 56 Plymouth


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If you have the flathead six cylinder it already has hardened valve seats and no gas additives are needed.
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dludvik76
Posted 2019-03-03 10:53 PM (#578840 - in reply to #578827)
Subject: Re: Fuel / gas type for 56 Plymouth


Member

Posts: 36
25
Thanks guys. I have the v8, and I'm going to run a compression test this week to see what it looks like. I'll go with the additives suggested, really appreciate it
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oldwood
Posted 2019-03-04 1:03 AM (#578844 - in reply to #578840)
Subject: Re: Fuel / gas type for 56 Plymouth


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Location: little rock, AR
Non Ethanol fuel. Make sure your using fuel injected fuel hose. Ethanol eats up rubber. Destroys fuel pumps. The list goes on and on.
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ronbo97
Posted 2019-03-04 3:59 PM (#578867 - in reply to #578844)
Subject: Re: Fuel / gas type for 56 Plymouth


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Location: Connecticut

No additives needed, assuming you have a small V8 in there. 

Ron

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drosera88
Posted 2019-03-06 7:12 AM (#578929 - in reply to #578844)
Subject: Re: Fuel / gas type for 56 Plymouth



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Location: San Antonio TX

oldwood - 2019-03-04 12:03 AM Non Ethanol fuel. Make sure your using fuel injected fuel hose. Ethanol eats up rubber. Destroys fuel pumps. The list goes on and on.

This. Ethanol is a bigger concern for you than unleaded fuel. If you can't get ethanol free, consider using an ethanol treatment to help negate the effects of ethanol. 

https://www.pure-gas.org/

 



Edited by drosera88 2019-03-06 7:13 AM
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