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MSD Ignition 6421 Digital 6AL-2 Ignition Control Box

121-6421


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6421 Digital 6AL-2 Ignition Control Box
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$430.95
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Digital 6AL-2 Ignition Control
  • Per Spark Energy: 135 mJ
  • Built-in 2-Step Rev Limiter with Rotary Dials (No Chips)
  • Red
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    6421 is rated 4.4 out of 5 by 12.
    Rated 5 out of 5 by from 5 stars sort of Well I did not expect to have to change out my MSD box and so changing two boxes-“I had a spare”. Apparently the MSD Blaster coil was the culprit. I did a Ohmmeter test on the coil and it was in spec I checked the entire harness on my drag car for a short. After frying my spare MSD box I was frustrated. Talking with MSD Tec they revealed that although the coil checked to specs when powered it can short . I bought a new coil and a MSD box Problem solved. I got a repair authorization number from MSD to repair the burnt boxes Hopefully MSD will be kind on the repair cost.
    Date published: 2019-09-18
    Rated 5 out of 5 by from great price easy to set up . I have not completed my project yet. Still working on fuel system. i am installing a power glide with trans brake. I will install MSD Box later also. I still have to order my 90/10 shocks. all of these parts where recommended by my old drag racing buddy. Roger O Smith in Jones county MS. my project is a 1956 chevy pro street truck.
    Date published: 2018-01-14
    Rated 5 out of 5 by from Replacement Bought this unit to replace an older Digital 6 unit that was not serviceable. This unit also all the features that I needed and was a little cheaper that a new Digital 6. This unit is a little smaller that my older unit.
    Date published: 2016-06-14
    Rated 5 out of 5 by from Fantastic ignition I've had this box installed for a month now and performance is far above what my old duraspark was capable of. Fires up instantly, looks great, easy installation, and having a built in 2 step just seals the deal.
    Date published: 2015-11-06
    Rated 5 out of 5 by from Excellent upgrade over the original AL 6 box. Smaller and the ignition indicator light is a real plus to signal proper ignition operation.
    Date published: 2015-09-27
    Rated 5 out of 5 by from MSD is quality I bought this for a 94 Toyota truck. Didn't know I had to order another part for the install to work. Figured it all out. Directions was easy. The launch control is amazing!
    Date published: 2015-08-26
    Rated 5 out of 5 by from MSD with great features!! I purchased this about one month ago. I am so glad that I did because we use it in a stock car. It solved all my issues with my ignition. Easy install and easy to work with.
    Date published: 2015-06-25
    Rated 2 out of 5 by from Runs rough with it hooked up Was installed properly and runs rough when hooked up
    Date published: 2021-02-26
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    Can a timing controller  be added to this to help start my car ? 

    Asked by: Turboz
    Not this part, you may want to look at this - https://www.jegs.com/p/MSD-Ignition/MSD-Starter-Saver-w-Signal-Stabilizer/750032/10002/-1
    Answered by: Rusty B
    Date published: 2020-06-23
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