" From: farna@xxxxxxx " " It sounds like you're describing " what's sold as a universal fit coil for older cars. They include the " resistor because some pre 67 cars used a coil with a built in " resistance, some an external ballast resistor. nb. i've never taken an old coil apart, but i don't think it'd have an internal resistor because of the heat factor. i've always assumed that the primary was just wound with more turns, for more resistance and less current draw at 12v. the spark wouldn't be as hot as a regular coil at 12v but it could match the regular coil through the regular ballast. and btw both my '66 americans and my '67 marlin, all sixes, had the high-resistance coil. my '68 199 doesn't. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought