Just so. Originally *all* engines had hardened seats and valves, deleted
once the VSR protection benefits of lead had been understood. Originally
massive (relatively) amounts of lead were being used, gradually reduced over
time, until at the end barely more than trace elements were found to be
effective.
----- Original Message -----
From: "Bob Howard" <mgbob@juno.com>
To: <Pointparty@aol.com>
Cc: <mgs@autox.team.net>
Sent: Friday, April 16, 2004 2:28 PM
Subject: Re: lead substitute fuel additive
> ... Once on the market, it was quickly learned
> that reduced valve wear was another benefit of the lead.
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