Ok I am thinking about redoing my motor in my K5. Mainly just swapping out pistons, some 64 chambered heads and bump my compression up a good bit. Say 10.5:1. Is it so uncommon for tral rig to run on race fuel? I'm looking for more power from the motor, want to be able to through a little nitrous at it as well. And race fuel smells good. My dad runs race fuel in his Street Stock class dirt track car so I have access to fuel. Only thing I can think is I would have to load the trailer with extra fuel in case we decide to take a longer run.