Not real sure what you are getting at here. "regular leaded" gas was useful because the additives prevented the valve seats from pitting when made from the head parent material, usually cast iron. New and remanufactured heads have valve seat inserts that do not need this due to the material they are made of, and any treatments to the materials in manufacturing. ANY head made from aluminum (Harleys from the Panhead on in big twins) need a seat insert anyways, and IIRC never required the lubricitive qualities of the leaded gas for the seats.

 

They all run on unleaded gas, you been in a bubble or something the last 35 years?

 

You been freeze dried? or doing hard time?

Stitch Jones

 

Funny post.....it will be pretty hard to go buy a gallon....
LOL
He must have just awoken from a
coma?

The OP can check at the airport...aircraft engines still use archaic parts.
They are slower in progress then the HD !

 

Could the OP really mean ethanol (E85). Almost all of us are running E10 but my F150 is a flex fuel and will run E85. Don't know of any bike that would run E85 and I know even E15 will damage small engines.

 

Most of 'em run on kerosene now. Same stuff as jet airplanes. Try it in your bike. I think you'll be surprised at the difference in performance.

 

I was kinda thinking that myself but really confused by his mention of muscle cars of the 60s and thought maybe he means leaded instead of unleaded

 

I have the only one. Make that two...

 

The first half of your post conflicts with the second half. In the "Fashion of ...........of the 60's"- in the 60's there was no unleaded pump gas that I recall Muscle cars of the time may have required Premium Leaded gas. As opposed to regular octane leaded gas.

All gasoline engines sold in the USA have to run on unleaded gas, since leaded gas in the USA anyway, is long gone.

So not exactly sure what you're asking.