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 Lead Substitute for gas?

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57Kelii
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PostSubject: Lead Substitute for gas?   Sat Sep 22, 2012 11:46 pm

Hey guys, I was reading up about gasoline for old cars, and is it true you need lead substitute in your gas? Is it really needed? And if it is, why?
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PostSubject: Re: Lead Substitute for gas?   Sun Sep 23, 2012 1:57 am

Because in the old days gasoline used to have lead in it,and that lead would help be a cushion or a buffer on the valve seats in the cylinder heads, so the solution is to retrofit the heads for whats called "hardened valve seats" basically if you run unleaded gas on an old car like Christine eventuallty the valves wont seal properly,or theyll prematurley wear out,,
If the vehicle has the original valve seats you can add a lead additive to each fillup,but its far more practical to just have hardened seats installed so you can run unleaded gas without the premature wear on the valves. Smile
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PostSubject: Re: Lead Substitute for gas?   Sun Sep 23, 2012 3:06 am

Thanks Smile
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PostSubject: Re: Lead Substitute for gas?   Mon Sep 24, 2012 8:38 am

The high nickle content of mopars iron usually negates the need for lead sustitute. They just don't seem to have the same issue with valve seat recession like chevy or ford. The only time I think you need it is if you are really working the engine hard, like towing a trailer up a hill.

I have run many cars with leaded fuel engines on unleaded without a problem. Put 100,000 miles on one valiant with just 87 octane unleaded and never had a problem.



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PostSubject: Re: Lead Substitute for gas?   Mon Sep 29, 2014 3:10 am

The alternative I have found is to use 91 octane non-oxygenated gas. This is the stuff you use for your lawn mowers and so forth. Trouble is it can be hard finding stations that carry it.
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PostSubject: Re: Lead Substitute for gas?   Mon Sep 29, 2014 11:55 pm

that is all i use Bluebird Very Happy

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PostSubject: Re: Lead Substitute for gas?   Tue Sep 30, 2014 9:25 am

I use to add lead...but many years ago someone told me I was wasting my money. They basically said what RacerRick has explained...so I stopped using it. Haven't ever had a problem...but I do use the 91 octane non-ethanol gas otherwise I get pre-ignition (pinging) and I'm sure the ethanol would destroy rubber/gaskets in the fuel delivery system.

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PostSubject: Re: Lead Substitute for gas?   Tue Sep 30, 2014 2:29 pm

Speaking from the experience of owning lots of old cars: if the exhaust valves are going to recede into the head, they're going to do it whether or not you add lead or lead substitute to your fuel. Not worth the money and tetraethyl lead is absolutely awful for us to breathe.
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