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Just a word to the wise about the lead additive, years ago my dad ran that in his 1960slant 6. When he went to do a head swap, he found build up of the additive in the exhaust runners of the head. This is do to the fact that it isn't actually lead, but a substitute. If your keeping the car, and have problems with the valve seal, you may as well convert the heads to run on unleaded.
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