Ran it in the late 70's for my 12-1 engine. Ran out of gas one night and put Sunoco 260 in, one mile later the engine quit with a huge amount of white smoke. Took a head off and 3 of the 4 pistons on that side had holes in them...
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
