340 Demon

I have 11.7 compression in my X headed 340 and can’t do anything more that putt around on 91. I don’t know how you can even run 91 in a 13.5 engine….


Like was said above…. The heat really won’t matter…. The pistons will be destroying themselves anyway….


FYI.... My normal mix is 50/50 of 92 and 110.