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MSD 6425 6AL Digital Ignition Control Box
MSD 6425 6AL Digital Ignition Control Box

MSD 6425 6AL Digital Ignition Control Box

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MSD 6425 6AL Digital Ignition Control Box
MSD 6425 6AL Digital Ignition Control Box
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Part # 5476425
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.


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HolleyDAYS are here again! SAVE up to 20% on this part and hundreds of other Holley brands during the 2018 HolleyDAYS sale 11/15/18-12/31/18.

The MSD Digital 6AL features a higher output with 530 primary volts and 135mJ of spark energy. Efficient components use less current to produce more power. Set an rpm limit on the MSD 6AL rev limiter with two rotary dials. Has the same bolt pattern as the original 6AL, but with a lower profile housing. Built-in LED for system checks. All wires exit the same side through a locked, sealed connector. Compatible with 4, 6 and 8-cylinder engines.

547-6425 Instructions (PDF) 

MSD Tech Bulletin

Learn more about the benefits and features of the MSD 6AL Digital Ignition Control Box by reading StangTVs tech article.  MSDs Newest 6AL Takes Conventional Ignitions into the Digital Age.

Learn more about determining the proper MSD ignition control box for your application by reading our tech article. The Differences Between 6 Series MSD Ignition Control Units.


  • Spark Energy:  135-145 mJ per spark 
  • Primary Voltage:  520-540 Volts 
  • Secondary Voltage:  45,000 Volts 
  • Spark Series Duration:  20 degree Crankshaft Rotation 
  • RPM Range:  15,000 RPM with 14.4 Volts 
  • Voltage Required:  12-15 Volts, 7 Volt Start 
  • Current Draw:  .7 Amp per 1,000 RPM 
  • Weight and Size:  1.7 lbs., 8"L x 4"W x 1.825"H 
Some parts are not legal for use in California or other states with similar laws/regulations

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Videos & Articles
  • Looking for an easy performance upgrade to your ignition system? MSD's line of Ignition Control Boxes offer extreme improvements to drivability and high rpm applications. Here's a look at the differences between the 6 series line-up.
  • In this episode, Project Chevelle takes a big step in its muscle car transformation. It's out with the little old 307 and to the dyno with our new 383 from BluePrint Engines!
  • Want to upgrade the HEI your old motor came with? Here is some advice!
  • Speedway Tech Zach discusses the Pertronix Ignitor III conversion in his '55 Chevy.

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