Well now we know where the Marvel comes from in the Mystery Oil's name. The Essex will turn over now.
I got a little more info and I have a book coming from Australia, It is not a '23 it is earlier. One fellow told me a 1919 or 1920. It seems that in an attempt to improve the intake flow in '22 they moved the spark plugs from the left to right side. I guess the engine I saw had the wrong year on it. They also lowered the compression and went to a timing chain instead of a gear. The older engine is supposed to be the better design, The Essex splash oil system is said to be a very good system and in some ways better than the older full pressure systems.
