I have been running a set of Iron Eagles for a few years now, was BSing with Maddad today he said that he thinks I should be running extended tip plugs. So fart all I have run are MR43T's and the NGK equivalent neither of which have extended tips. The MR43T's run a tiny bit better then the NGK's in my engine, both are great plugs. The heads are 72cc with 200 runners 2:02 valves, compression comes out to 9:135. Phil