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MSD Ignition Digital 6AL Ignition Control Box

MSD Ignition 6425


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MSD Ignition Digital 6AL Ignition Control Box $262.95
Digital 6AL Ignition Control
  • Per Spark Energy: 135-145 mJ
  • Built-in Rev Limiter
  • CARB E.O Number D-40-43
  • Red

  • MSD Ignition 6425 Details

    6-Series Digital Ignition Controls

    MSD's Digital 6AL Ignition has the same footprint as the original 6AL yet incorporates a sleeker, lower profile and relocated rev limiter. The limiter is on top of the housing for easy access to the two rotary dials that control the rev limit in 100 RPM increments. To simplify installation and keep things tidy, all wiring is routed out one end of the ignition box through a sealed connector. Inside the Digital 6AL Ignition, a microprocessor manages and monitors every firing while high-efficiency circuits make more power using less current.

  • Compatible on 4, 6, or 8-cylinder engines with 12-volt negative ground electrical systems
  • Same bolt pattern as traditional 6AL but with low-profile housing
  • Delivers 530 volts to the coil with up to 135mJ of spark energy per firing
  • Efficient internals draw less current to produce more power
  • Set rev limit in 100 RPM increments with two rotary dials
  • All wires exit on same side via sealed/locked connector
  • Accepts trigger inputs from breaker points, amplifiers, and magnetic pickups
  • Includes wiring harness, necessary installation components, and vibration mounts
  • Built-in LED for system checks
  • CARB E.O Number D-40-43
  • Specifications
    Spark Energy: 135 to 145 mJ
    Primary Voltage: 520 to 540
    Secondary Voltage: 45,000
    Spark Series Duration: 20° Crankshaft Rotation
    RPM Range: 15,000 with 14.4 volts
    Required Voltage: 12 to 15 (7-volt start)
    Current Draw: 0.7 amp per 1,000 RPM
    Size: 8" L x 4" W x 1.825" H
    Weight: 1.7 pounds

  • Specifications:

    Height (in.)
    Width (in.)
    Overall Length (in.)
    CARB EO Number
    D-40-43 (pdf)
    CD Voltage Output to Coil
    520-540 V
    Coil Included
    Current Draw
    0.7 amps per 1,000 rpm
    Data Acquisition
    Ignition Box Color
    Ignition Box Output
    Capacitive discharge
    Maximum Operating Voltage
    15 V
    Minimum Operating Voltage
    12 V
    Sold individually
    Rev Limiter
    Spark Output (millijoules)
    135-145 Millijoules
    Timing Retard
    Manufacturer's Part Number:

    MSD 6-Series Ignitions set the standard for quick starts, increased power, smooth idle, crisp throttle response and reduced spark plug fouling. MSD ignitions are available in a several styles and install easily in a variety of applications.

    Digital 6A: Base model with multiple sparking, capacitive discharge (CD) ignition control.
  • Hotter Spark for Improved Driveability.
  • Without Rev Limiter - Can Not Be Added.

    Digital 6AL: Digital 6AL or 6BTM Ignitions are made for spirited driving, grabbing gears or some form of racing.
  • Includes Adjustable Soft Touch Rev Control.
  • Can Add a 2-Step Module Selector for Launch rpm Limit.

    Digital 6AL-2: Ideal for the street and strip applications.
  • Includes Built-in 2-Step Rev Control.

    Digital 6 Plus: Ideal for 4, 6 and 8-cylinder engine applications.
  • Includes Built-in Drag Race Features, 2-Step Rev Control, Single Stage Retard and Start Retard.

    Programmable 6AL-2: Provides PC programming for the street.

    Extreme Duty 6ALN: For severe duty applications such as off-road truck racing or saturday night dirt tracks.
  • Sealed locking connectors and epoxy for vibration resistance create an ignition ready to take on the rigors of hard-core racing.

    Hardcore 6CT: The most advanced ignition for circle track racing.
  • This ignition contains MSD’s smoothest rev limiter available and is ready to take on the rigors of hard-core racing.

    Marine: All of the power and multiple. sparks of an MSD, plus a rev limiter for Marine applications.
  • Includes sealed Weathertight connectors.

    Professional Racing: Designed for professional long duration, high-rpm racing.
  • Features NASCAR mandated harnesses, a clear baseplate and vibration dampening silicone.
  • Uses a special Coil (121-8250) & produces higher spark energy and voltage.

    JEGS Easy Kits are designed by JEGS professionals to help you get all the performance parts you need.

  • 6425 is rated 4.7 out of 5 by 9.
    Rated 5 out of 5 by from Good looking unit Switched over to e85 built a 427 for a 69 Camaro this 6a ignition box is a must very happy with the performance
    Date published: 2016-10-27
    Rated 5 out of 5 by from Works Good Works as it should, the last 6A I had lasted 20 years.
    Date published: 2016-09-26
    Rated 5 out of 5 by from My MSD purchase. Faster delivery than I thought! Great job guys! I'll buy again!
    Date published: 2016-02-23
    Rated 5 out of 5 by from Great product Installation was a breeze Great instructions easy to follow easy excess to rev controls
    Date published: 2015-12-26
    Rated 5 out of 5 by from great products Easy installation, would definitely recommend msd and jegs to everyone
    Date published: 2015-09-25
    Rated 5 out of 5 by from Great Product I always go with Msd . The best on the market. And real easy to install
    Date published: 2015-08-27
    Rated 5 out of 5 by from MSD Good product used MSD a long time. That's all I'm gonna say
    Date published: 2014-11-01
    Rated 4 out of 5 by from Great standard features. The "go to" electronic ignition control unit for street performance. Updated digital rev control is a nice feature vs. plug in modules.
    Date published: 2014-12-25
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    Will an HEI distributor work with this product?

    Asked by: HellcatNova383
    We would need a little more information on the distributor to properly answer that. Please give one of our tech representatives a call at 1.800.345.4545.
    Answered by: Dean R
    Date published: 2017-12-09

    Will a MSD 3-step module work with this ignition?

    Asked by: RedBaron
    Yes, the 3-step will work with this ignition box.
    Answered by: Rusty B
    Date published: 2018-07-13

    Will MSD 6AL Digital ignition control work with Pertronix Flame Thrower ignition II distributor.

    Asked by: Whiskers
    You are able to use the MSD box with the Ignitor distributor with no issues. Be sure to follow the wiring diagram with the MSD box.
    Answered by: Flanary
    Date published: 2017-08-23
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