Think you have the valve materials switched, maybe, and 100/110 "lowlead" avgas has multiples of the car lead quantities. It is lower lead than 145 fuel and 80/87 is not readily available.
20 years ago I was able to have hardened faa approved seats installed in my O-290 lycomming and all the rubber parts were replaced with new style alky resistant AN hoses so I could buy a stc for cars gas.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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