Originally Posted by E.L.Green
as far as avgas, last i heard was as long as there is no catalytic converter it is legal
If you use Avgas in a catalytic converter engine it will ruin it by clogging it up. In the US you should not be able to buy Avgas, not saying that you could not get it if you put your mind to it.
Check this link out. It talks about Avgas and Corvette engines:
Gasoline Digest Page 2
When a piston aircraft engine is inspected you remove the spark plugs, clean, test and re-gap them. While cleaning
the plugs it is quite common to find deposits of lead. Sometimes the lead will get bad enough and the electrode will short out to the case of the plug
making it inoperative. These engines are designed to burn the stuff imagine what it is doing to your car or outboard
Just try to use clean and quality fuel.