I have a 2001 honda civic EX I/H/E, I recently had the head milled due to engine warping, my question is, since the compression might increase, should I still be able to run 86 octane or will I have to run higher octance gas? Also, I have a ticking sound coming from the camshaft, I'm pretty sure that it's my valve clearance, does anyone know the proper way to set that??? I know top dead center on each cylinder, rocker arms up... Is there anything else I need to know???