Avacado...isn't that an armored animal from the southwest? Oh no wait, it's a town in Colorado...right?

I believe that avacado stayed in there until '46 on GMC engines but I am not certain.

GMC TRUCK engines (*zing*) were red beginning in '49 and there is much conjecture about the '47-'48 engines with some people landing on the black side of the argument, and some landing on the dark green side of the argument. I stand firmly in the mouth agape dumb look side of the argument.