Barracuda Challenger Forum

Author Topic: which distributor for 440-6 with MSD 6AL  (Read 263 times)

Offline 734406pk

  • Andy
  • Sr. Member
  • ****
  • Posts: 1517
Re: which distributor for 440-6 with MSD 6AL
« Reply #15 on: April 17, 2017 - 09:11:41 PM »
QUOTE::
2 things I don't get #1 = why do I need a convertor box for my rallye dash tach to work if I install MSD 6AL and pro billet distributor? I have the orange box and regular vac adv dist now and no need for a special convertor box.
#2 = 734406pk, you're saying that if I have a vac adv dist then no need for MSD box...but I need the orange box?why? And yes they do make RTR pro billet msd, found it at summit's link.

#1= You need a converter box for your rallye dash tach when using the MSD 6AL, regardless of which distributor you will be using. The tach waveform from the MSD6 AL is different (12 volt square wave with a 20% duty cycle) from what the rallye tach is designed to read for RPM when using the MOPAR orange box.

#2= If you want an MSD pro billet distributor with a vacuum advance, you will need to get the RTR model:
https://www.summitracing.com/parts/msd-8387/media/instructions
This distributor does not require the MSD 6AL to work, it has an internal ignition amplifier inside the distributor. A MSD 6AL can be connected to it if you want.
       If you want to use the MSD Pro Billet distributor without the vacuum advance, you will need this one:
https://www.summitracing.com/parts/msd-8546/overview/make/dodge
This distributor will require an amplifier ie  MSD 6AL to work; no internal amplifier, just a magnetic trigger only, just like the MOPAR distributor.

The main advantage for using a MSD distributor is the ease of adjusting the advance curve and timing advance for modified engines IMO. The MOPAR distributor can connect to the MSD 6AL as well to take advantage of the multiple spark discharge. I would use a matching MSD ignition coil to avoid any issues.
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive




Offline 351c4v71

  • Jr. Member
  • **
  • Posts: 229
Re: which distributor for 440-6 with MSD 6AL
« Reply #16 on: April 18, 2017 - 08:13:22 AM »
Thanks!

Offline HP_Cuda

  • Hit the skinny little pedal on the right!
  • Sr. Resident
  • ******
  • Posts: 5269
  • Mopar or No Car!
Re: which distributor for 440-6 with MSD 6AL
« Reply #17 on: April 19, 2017 - 11:45:32 AM »

Yep that would qualify as old.

 :bigsmile:
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD


Offline dodj

  • Sr. Resident
  • ******
  • Posts: 6111
Re: which distributor for 440-6 with MSD 6AL
« Reply #18 on: April 19, 2017 - 09:29:07 PM »

So you run the MAS 6AL box , correct? with a mopar dist? Does your original tach work and did you need a special convertor box for it?
I'd like to start with such a set-up before dishing out the dough for a pro billet.
Thanks
I use an MSD 8290 converter. The original tach in your car will not work with the MSD tach output.
Scott
1973 Challenger  440 4 spd 
2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
Good friends don't let friends do stupid things. ........alone.

Offline 351c4v71

  • Jr. Member
  • **
  • Posts: 229
Re: which distributor for 440-6 with MSD 6AL
« Reply #19 on: April 21, 2017 - 02:42:01 PM »
Tanks DODJ!