A book I read on auto restoration said that an engine that ran leaded long enough had enough lead embedded in the valve seats to protect them. Newer head rebuilds should have hardened seats as a matter of course. Shouldn't need lead substitue unless you install an NOS head without changing the seats.
Current fleet (subject to change w/o notice) \'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run. My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787. Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
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