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The lead lubricated the valves so they wouldn't wear out the valve seats. Cars now have hardened valve seats so the lead is no longer needed.
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Gregg
1970 gsx, yellow, #'s match, cam, headers, intake.
87 GN hardtop. 64k, champion ported irons, 210/215 roller cam, t63e,50#'s,alkycontrol,Pat's 10 in conv.,thdp,hotwired 340,TT chip,powerplate and so on...10.93@125.68 1.68 60'
http://community.webshots.com/user/1970gsx
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