When you put two ballast resistors in line, this equates to more voltage to the coil. I ran two MP 1/4ohm ballasts for two years with a FBO coil, and the coil voltage went up two volts. The FBO coil is a good one and the two ballasts did not hurt it. That coil was designed for 11.5 volts. I would not attempt this on a stock type coil.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
