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> You can't make adjustments since the lead in the fuel was used to increase > the > octane of the fuel and as a lubricant/cushion for the valves. I have been using leaded aviation fuel (100 octane) in my '63 notch and '56 oval. Has anyone heard of a good reason NOT to do this ? It is called 100LL, i.e. 100oct Low Lead. Being low lead doesn't mean it has less lead than leaded auto fuel though. As a matter of fact, it has more lead than non-low lead avgas, like 80oct. I usually mix it with 93oct auto gas like 70%avgas/30% 93oct autogas. Am I going to cause any damage by this ? I wouldn' t think so. I asked a guy who used to mix race fuel for us and he joking said it'll fly (hehehe). The timing is set 10'BTDC, and it seems to love it. kevin chapman '63 jet-fueled notch