Stroked Big Block Ignition

Big Block A body Tech

  1. mopowers

    mopowers Well-Known Member

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    What do you guys with stroked big blocks run for ignition? HEI, MSD, or? I'm acquiring parts for my 470 build and am trying to decide on an ignition. My 4-pin GM HEI seems to work well on my SB, but the features that some of the MSD and similar boxes provide seem attractive as well.

    What do you big block guys run?
     
  2. Kendog 170

    Kendog 170 Let the boy go !

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    Stock right now. My MSD shit the bed after two months. Had to Temp wire stock back in. MSD warrantied it so this spring I'm wiring up both to have stock set up for spare so I'm not stranded again.
     
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    • Kendog 170

      Kendog 170 Let the boy go !

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      I'm also entertaining the idea of GM hei hidden in the Stock ECU box
       
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      • Kendog 170

        Kendog 170 Let the boy go !

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        • vitamindart

          vitamindart Well-Known Member

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          I ran an MSD distributor locked out, with a 6AL box. no issues ever. my box was under the dash away from the heat and vibration.
           
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          • mopowers

            mopowers Well-Known Member

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            I should've probably specified that I'll be running a MP electronic distributor.

            Has anyone had any issues with the digital boxes on the market - say from Crane, Mallory, MSD, etc.

            What is the engine/car combo?
             
          • TheGrateRonzini

            TheGrateRonzini FABO Gold Member FABO Gold Member

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            Msd 6AL and probillet diz. Have yet to have an issue
             
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            • vitamindart

              vitamindart Well-Known Member

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              72 dart with a 493 RB based stroker , ran it that way at 14 to 1 and 11 to 1 both worked great
               
            • Kern Dog

              Kern Dog FABO Gold Member FABO Gold Member

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              I was going to post about THAT very distributor...
              Rick Ehrenberg from Mopar Action magazine has stated many times that he thinks that most of the MP electronic distributors are junk. STOCK ones were great but the reproduction Mopar Performance units are not despite the fact that they look similar from the outside. The problem is that the MP units were essentially a scaled down version of a GM HEI design and R/E claims that not all things scale down properly. The weights in the MP unit are tiny and don't weigh much, leading to unstable timing and spark scatter. He believes that these distributors are "Un-Tuneable".
              I've had one for many years. It works but I can attest that the timing does jump around. I can run the engine to any rpm and look at the timing marks with the light and see it dance around. I have to watch it move back and forth and guess what the middle number is and assume that I have it right.
              I did not want to use an MSD. The huge control box looks ugly to me. For years, I have considered just getting a stock RB distributor and welding up the slots a bit to narrow the curve. I did just that last Summer for a B series distributor that is going in the 383 in my "Jigsaw" Charger.

              Jiggy F 2A.JPG
               
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              • mopowers

                mopowers Well-Known Member

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                Very interesting that you mention that, Greg. That actually makes a ton of sense. I run a MP electronic distributor on the 340 in my other Dart along with a GM HEI module. I've never been able to get the timing stable with that thing, especially at idle. I've got a collar on the distributor shaft near the intermediate drive gear and a really good timing chain, and have just chalked it up to it being a product of having light springs in the centrifugal advance mechanism.

                I found a deal on a new low deck BB MP distributor years ago and it's just been in a box on the shelf awaiting use. I may have to rethink using it on this particular build.
                 
              • Kern Dog

                Kern Dog FABO Gold Member FABO Gold Member

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                I plan to get a rebuilt electronic 440 distributor and weld the slots like so....

                383 D 11.jpg 383 D 17.jpg

                That was my 383 distributor. A fresh RB rebuilt unit is going to have new bushings, pickup, reluctor wheel and a clean appearance.
                The beater Charger is a 383 model. I rebuilt the original mill and am waiting to install it after the 5 speed swap is done and all the bugs are worked out with this car....
                Charger 10 fffx.JPG
                 
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                • Bewy

                  Bewy Well-Known Member

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                  Great looking car....
                   
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