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· Premium Member
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Actually the consensus is to put in hardened valve seats, which requires the removal of the head. As a stop-gap measure, I have been using lead "substitute" on both my truck ('63 Dodge max wedge heads) and my Kadett. Does it work? I don't know, but you can actually tell a difference in the pinging of the motor if I don't, so I can justify it.

There are different types of lead substitute, but the one I use comes "concentrated" and the bottle is supposed to treat something like 300 gallons for the bottle. Basically it is cheaper, so it wins, but I really don't know the differences.
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