Ok gentleman, fuel is not the issue here.
I put 87 Octane fuel in my 261 and will drive it all day long. I will drive at speeds that most don't do in thier daily drivers.
If your running with old gas, unchecked components, and many other things, these engines will break. Pulling a truck out of where ever, changing the oil after it sat for a long time, and driving it is not an easy task for any engine.
Take that same engine, pull it apart, clean it up. Fix the other fundamentals of these trucks, and trust me, you will reach your limts before you reach the truck's.......
