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Don't believe all that you see or hear from "experts".Don't take what they or I say as the gospel.Do some research on their "facts" and then make an informed decision as to what you feel is right.Many,if not most, times you will find that the "experts" were full of BS.
Wow.... so much stuff to take in!Ive run avgas here in Oz for years in our off-roaders BUT the engine was built to run on avgas. Also I dont know if our avgas is the same as yours (dont see why not but...). But for decades avgas was our sports std fuel. So much so that at larger events there was a tanker selling avgas direct to competitors.Several years ago avgas was banned as competition fuel and we now use std pump gas AND the engines are built for this gas. The main reason for the banning was because of upper cylinder lubricant (read that as lead content). I am guess that that is what is diferent today, avgas has no lead content and the lubricant these guys are refering to is for valve seats etc. Thsi would be necessary for some aviation uses but not so for short life span competition engines (IMO.. of course).When I say built for a certain fuel, this entails compression ratios (even engine gearing) and very importantly spark advance maps (particularly if using the entire rev range as a buggy does).I come back to the fuel the engine was designed for, changing fules without consideration to other parts of teh engine can well lead to pretty quick destruction.Good luck, if it aint broken ... dont fix it!
Lead is not necessary at all for valve life.All that is needed is hardened valve seats on the exhaust side. They can be integral induction hardened cast iron or steel inserts. Either one will allow the use of unleaded fuel of any kind. No upper cylinder lube is needed or necessary on any modern engine produced in the last approx. 25 years.
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