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-   -   MSD Ignition box (https://classracer.com/classforum/showthread.php?t=84193)

mike britt 02-12-2023 07:35 PM

MSD Ignition box
 
Can you get away with running a 6AL or do you have to have a 7AL. This is a 350 TPI 245/281 combo. Any advise would be appreciated.

Rory McNeil 02-12-2023 11:32 PM

Re: MSD Ignition box
 
I have had the same MSD 6T ignition box in my low 10-high 9 second bracket car for over 30 years, with zero issues. And I used a MSD 6AL in my 85 Mustang Stocker, but have never used a 7 series box, so I can`t say if a 7AL may potentially be any better. Certainly didn`t notice any downfalls with the 6 series.

427FE 02-13-2023 08:10 AM

Re: MSD Ignition box
 
Do you have it already?

Henrys Toy 02-13-2023 09:26 AM

Re: MSD Ignition box
 
Quote:

Originally Posted by mike britt (Post 675900)
Can you get away with running a 6AL or do you have to have a 7AL. This is a 350 TPI 245/281 combo. Any advise would be appreciated.

Good morning to all,
Yes you can certainly use an MSD 6AL box, the 7AL " might " be slightly better in overall performance, but the 6 box will work. Over the years I've found the 6 series boxes to be the most reliable. That's what I've found, good luck with your racing season.

Respectfully,
Henry Kunz 1534 H/SA

Craig Porter 02-13-2023 09:36 AM

Re: MSD Ignition box
 
I bought a bracket car from a friend of mine two years ago and it had a digital 6 plus in it and worked great . I completely rewired the car last year and put a 7 AL box in it that I had and it didn’t run any different .

4543 02-13-2023 09:41 AM

Re: MSD Ignition box
 
Mike I have a Digital 6 in the Corvette. Works fine. How’s the car doing? Mike McMahan

mike britt 02-13-2023 09:44 AM

Re: MSD Ignition box
 
I have a 7 AL2 in it now but I am going to replace it because I think it has a problem. At 6300 it acts like it's on a rev limiter and I allready replaced the distributer and wires so it's next.

PozQB14 02-13-2023 10:06 AM

Re: MSD Ignition box
 
Hey Mike, what kind of shifter do you have? A few years ago, I had a similiar problem and it was my turbo action line lock button that wasn't fully disengaging. I had to push on the wires to ensure the little red button was fully out.

M120 02-13-2023 02:05 PM

Re: MSD Ignition box
 
I replaced a 7AL2 with a 6AL between rounds after having the car shutdown on return road. Before it shut off the tach was jumping all over the place and would barely run.
I was racing an index class using weight to run the index. I didn't change weight after replacing with 6AL and ran exactly the same ET.
This was with a ZZ4 engine making around 380 hp . 11 second Chevelle

Adger Smith 02-14-2023 04:48 AM

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.


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