cast iron Prestolite/Pertronix ignitor conversion

I am curious about how well it works for accurate timing of each cylinder. Early Pertronix used small magnets in the plastic cam cover. The trigger module is a Hall effect device. The new design uses the cam peaks to trigger using a magnet biased Hall device. The early Pertronix suffered from individual cylinder timing errors relating to less than perfect magnet matching. The new Pertronix get around that issue, but the cam as a trigger target is not optimal for a couple reasons. Good Hall targets have sharp edges, so triggering point is well defined. A cam designd for points is a ramp, the trigger point varies with runout. Good targets are also annealed low carbon steel, for more uniform magnetic properties. The cam hardened for point application, making it less desirable target.

It is fairly easy to evaluate inter cylinder timing accuracy. A lathe, mill or distributor machine is used to rotate distributor. The ignition coil is replaced by resistor. Two resistors are used to attenuate the resistor peak voltage from 12V (power supply) to 5V. A logic analyser is used to capture the signal and evaluate the timings. I use a Saleae logic USB device purchased years ago. The signal goes high when triigger and is low when coil would be charging. The logic analyser software is easy to use for timing measurements. An 8 cylinder engine fires 8 times in 2 revolutions (720 degrees). The rising edge spacing should be 90 degrees apart. Simple math directly translates time variation to timing degree variations.

I don't have a new one to test.

I wonder if @halifaxhops has spun some up on his distributor machine?