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Old 04-28-2008, 07:44 PM
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Simple yes or no engine question......

If I have an engine with heads that don't have hardened valve seats, can I just put lead additive in the gas and be fine?

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Old 04-28-2008, 07:47 PM
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Yes.........

I know you asked yes or no.....but, it takes a along time for unleaded fuel to destroy the valve seats........
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Old 04-28-2008, 07:51 PM
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Maybe............


Just kidding... I say yes, too
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Old 04-28-2008, 08:17 PM
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Yes.

since there is a ten character minimum, I'll add this. What does lead have to do with anything. It was used as an anti-knock compound, not a seat protector.

Mark
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Old 04-28-2008, 08:21 PM
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I thought that the lead also helped lubricate the valves and seats...........
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Old 04-28-2008, 08:29 PM
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Quote:
Originally Posted by Jmark
Yes.

since there is a ten character minimum, I'll add this. What does lead have to do with anything. It was used as an anti-knock compound, not a seat protector.

Mark
Toilet seats aside, one of the side benefits of lead was that it helped prevent micro-welding between the valve and seat, principally on the exhaust side. This prevented valve recession. I have seen many times the effect of using unleaded gas with older, softer cylinder heads. Depending on vehicle, load conditions, and other factors, valve seat recession with unleaded gas and older (pre-1975) heads could range from neglible to severe (.125" recession in less than 5000 miles.

Yes, you can use a lead substitute as long as it's not in a truck hauling heavy loads.

tom

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Old 04-28-2008, 09:22 PM
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Quote:
Originally Posted by machine shop tom
Toilet seats aside, one of the side benefits of lead was that it helped prevent micro-welding between the valve and seat, principally on the exhaust side. This prevented valve recession. I have seen many times the effect of using unleaded gas with older, softer cylinder heads. Depending on vehicle, load conditions, and other factors, valve seat recession with unleaded gas and older (pre-1975) heads could range from neglible to severe (.125" recession in less than 5000 miles.

Yes, you can use a lead substitute as long as it's not in a truck hauling heavy loads.



tom
X2 on the valve recession on extreme SEVERE duty stuff. My buddy had a fresh rebuild on a 68-70? 289/302? flat nose Ford van that was a single rear wheel mini-motorhome. After he got back fron a coast-to-coast trip, it was barely running. The valves were sunk that eighth inch or more! I think more! Never seen one that bad before, or since.
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Old 04-29-2008, 04:58 AM
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If you have acess to leaded race fuel just put a gallon of the good stuff in every so often it does not take much lead to lube the seats. A couple of gallons every 6 months or so should do it.
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Old 04-29-2008, 12:38 PM
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yes, if you want to, it may extend the life of your heads a bit, but they will eventually pound through anyways.
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Old 04-29-2008, 01:11 PM
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Yes. Yes. Yes.
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Old 04-29-2008, 04:45 PM
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"slim chance to none"......
that those heads haven't been burning "just" unleaded for many years and miles without lead additive....

so adding lead substitute now is likely... "to little to late"....

YES you can dump it in the tank...
will it do any good....("maybe")

can using it cause other problems (like plug fouling)
yup
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Old 04-29-2008, 04:54 PM
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If you really love the heads, take them to the machine shop and have hard seats installed. Everything else is just a crutch. I had hard seats installed in mine and now I drive worry free, and the expense is long forgotten.
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Old 04-29-2008, 05:20 PM
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I second using hardened seat inserts... its the quick and easy way to make those heads work long term.
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