they banned the import of all leaded race fuels in canada for an indefinate period (at least in nova scotia). I went down to the local race shop to get some and thats what i was told. so im shit out of luck as far as a supply of C-12 goes. i live on a lake and there are a few guys that have float planes and i found a fella that will hook me up with some 100LL av gas. not sure if i should get another set of domes cut or try cutting back the timing to compensate for the lower octane. if i do have detonation how will i know it . i never heard it before. is it noticably loud or do you keep checking the pistons? im running 195 psi in each cylinder at sea level. +6 advance on timing. this situation really sucks. any advice on this would be much appeciated. thanks in advance