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post #5 of Old 01-30-2012
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Originally Posted by dabnis View Post
IIRC, the lead acted as a "cushion" for the valve and seat contact. Older engines may suffer valve related problems without an addetive. I had an older Continental flat head engine and had to go with stellite valve seat inserts and stainless valves, or maybe the reverse? It was a long time ago.

Forgot, I think the lead was also supposed to help lubricate the valve guides.

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