Re: MSD Ignition box
 

Adger, that is an interesting chart. I have run the Pro Power coil on every car I have had for 40 years but they all had a 7 AL2 Ignition. I wonder why that coil won't work with a 6 A ignition.

Re: MSD Ignition box
 

Mike,
I wish I had an answer for you. I've had customers that ran into the same issue. Started quite a while ago with a Circle track customer Up grading and I another recently that had a distributor that wasn't compatible with his box.
If I got this right his box was a digital 6 and the distributor pickup was for an analog box. I have 3 coils that I kept with our dyno and a couple boxes. I always liked to dyno with as much of the customer set up as possible.
I've run 7 boxes in all my own cars, never any issues. I have noticed that the 6 boxes have a rev limiter that isn't as harsh as the 7's.