MSD Ignition box

Adger Smith · 02-14-2023, 04:48 AM

Make sure your coil matches the box you are using.
Chart:
https://www.holley.com/brands/msd/pr...gnition_coils/
There is also a difference in some of the distributor pick ups and boxes.
I think it is analog vs digital. ran into a couple of customers with match up issues a few years ago.
Make sure they are compatible.

mike britt · 02-14-2023, 11:33 PM

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.

Adger Smith · 02-15-2023, 06:47 AM

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.

02-14-2023, 04:48 AM	#1
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: MSD Ignition box Make sure your coil matches the box you are using. Chart: https://www.holley.com/brands/msd/pr...gnition_coils/ There is also a difference in some of the distributor pick ups and boxes. I think it is analog vs digital. ran into a couple of customers with match up issues a few years ago. Make sure they are compatible. __________________ Adger Smith (Former SS)

02-14-2023, 11:33 PM	#2
mike britt Member Join Date: Mar 2013 Location: Italy, Texas Posts: 176 Likes: 365 Liked 65 Times in 31 Posts	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.

02-15-2023, 06:47 AM	#3
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	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. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 02-15-2023 at 06:49 AM. Reason: sp