> core). As far as I know, the 13.25 inch arc I got out of an ignition coil > is by far the furthest ever recorded. In this case, the General Motor's > coil was picked as a standard. Ford and others coils don't count toward > the "GMHEICSLR". > > Cheers, > > Terry What did you do special? I've never been able to get more than three or four inches out of a single coil without internal breakdown, even running oil immersed? Ed