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Old Nov 10, 2013 | 01:08 PM
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Liquid lead?
A guy told me to put liquid lead in with my fuel for my 66f100. I have a 390 in it. He said the old motors will run better on leaded fuel. Anyone ever hear of this? Is there any merit to what he told me?
 
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Old Nov 10, 2013 | 01:55 PM
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That is supposedly to protect the valve seats. They used to put lead in gasoline as a lubricant and cushion for the valves and valve seats. Since the romoval of the lead there are now a number of after market lead substitutes available. I ran it in my 428 cj and it didn't help. Almost sucked the valves. Caught it just in time to save the heads. Best bet is to have hardened valve seats installed.
 
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Old Nov 10, 2013 | 02:04 PM
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So don't even worry about it?
 
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Old Nov 10, 2013 | 02:27 PM
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Originally Posted by 110
So don't even worry about it?
The lead additive is not expensive. If I were running the older valve seats I'd still use the additive. It won't hurt anything and may help. The brand I was using was called lead substitute and was in a grey bottle.
 
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Old Nov 10, 2013 | 02:29 PM
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Cool thanks cj
 
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Old Nov 15, 2013 | 07:53 PM
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you can buy the gas additive and hope it does what it says or pull the heads and have hardened valve seats put in
 
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Old Nov 16, 2013 | 09:28 AM
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If you do suck a valve it's new head time.
 
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Old Nov 16, 2013 | 09:53 AM
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Thanks guys
 
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Old Nov 16, 2013 | 10:14 AM
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Originally Posted by 69cj
If you do suck a valve it's new head time.

By the time you suck a valve your valve seat may have dug into the head making it junk
 
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Old Nov 16, 2013 | 11:18 AM
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Originally Posted by RustyTrustyF150
By the time you suck a valve your valve seat may have dug into the head making it junk
Exactly my point. Caught my cj heads in the nick of time.
 
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