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TobyE=> I had thought that lead was used because => it was a lubricant for the valves. Originally it was only added as an anti-knock agent, essentially to slow down the burn, and that incidentally after other, much safer agents had been identified. The valve-seat effect was discovered later. Steven Ayres, Prescott AZ '66 KG1600 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~