12.5 to 1 What octane do you run!!!

100LL is good stuff; if you need more detonation resistance, add a little MMT, watch plugs carefully, it goes brick red when you have too much. Torco Accelerator is a good source of MMT; read the MSDS, a little goes a long way. The Amsoil octane boost has MMT also, not sure how much, again, read the MSDS. S/F.....Ken M