I got a 480 kit in now and I will be running a 12:5:1 comp piston. I know I have to run 91 octane or higher fuel but whats rong if I had to put in regular 87 evry so often? like there are some locations on long rides that only offer regular fuel. lets say one tank out of 5 will be 87 octane maybe. Will it do dammage? I dont see how.