I think if you run a tap through, there is a good chance you will double cut the threads and just make it worse. Try a chase kit. Plus if its already threading in cock eyed, than you may not be able to rethread. A helicoil will work. Its not like you have to torque the shit out of the intake boot. But if a timesert is availble, I would use it. IMO if your looking at going .100 over, I would junk the cylinders and find another set.