You do not need lead substitute. Use petrol only , the highest octane
rating available, in EU it would be 98.
Adjust (retard) the ignition if necessary to prevent detonation. Do not
worry about recessed valve seats. It simply does not happen in most
cases with healthy engines, and when it happens it is time for a head
rebuild anyway with new valves and hardened valve seats.
It was a big scare when the lead in petrol was abolished. A lot of
people had their cylinder heads rebuild with hardened seats and better
valves at great expense. The industry loved it.
The people that did not bother were far better of as in the end there
were very, very few incidences with recessed valve seats, if any, in
spite of the full blown hype about it. Most trouble was as usual from to
tightly adjusted tappets.
Kees Oudesluijs
NL
[demime 1.01d removed an attachment of type text/x-vcard which had a name of
coudesluijs.vcf]
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