Digital 6AL Ignition Kit with Digital 6AL Ignition Control
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MSD IGNITIONPART NUMBER: 121-6425K

Digital 6AL Ignition Kit with Digital 6AL Ignition Control

$39994
More than 10 available
ShippingShips on Nov 02, 2026
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Street
    Digital 6AL Ignition Control Kit
  • Per Spark Energy: 135-145 mJ
  • Built-in Rev Limiter
  • CARB E.O Number D-40-43
  • Red
    Includes:
  • Digital 6AL Ignition Control
  • JEGS Control Box Mounting Plate

    Kit Part Numbers
  • Digital 6AL Ignition Control 121-6425
  • JEGS Control Box Mounting Plate 555-40681

    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.

    Features
  • 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
  • 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

    High-Output Ignition Boxes for Maximum Spark Energy

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

    Show More

    Unlock the true potential of your engine with the MSD 6-Series Ignition Control Boxes, a trusted choice for performance enthusiasts and racers alike. Whether you're cruising on the street or running hard at the track, the MSD 6-Series delivers the high-energy spark needed for complete combustion and maximum horsepower.

    Built with reliability and power in mind, the MSD 6 Series ignition boxes feature capacitive discharge (CD) technology that produces multiple sparks during the combustion cycle, resulting in smoother idling, quicker starts, and improved throttle response. This multi-spark feature is especially beneficial at lower RPMs, ensuring more efficient fuel burn and fewer misfires.

    The MSD 6 Series Ignition units are housed in a durable, vibration-resistant aluminum case that’s ready for the rigors of street or strip. Easy to install and compatible with a wide range of engines and distributors, this versatile ignition box is a go-to upgrade for those looking to enhance overall engine performance.

    Whether you're running naturally aspirated or forced induction, the MSD 6 Series Ignition Control gives you the confidence of consistent spark delivery at high RPMs, helping your engine perform at its peak when it matters most. With several models available—including options for street, marine, and racing applications—there’s a 6-Series box tailored to your build.

    Choose MSD for proven ignition technology that boosts performance, improves efficiency, and ensures your engine fires strong every time.

    The MSD 6 Series Ignition Control Boxes are a cornerstone upgrade for performance enthusiasts seeking stronger spark energy, improved combustion efficiency, and reliable high-RPM performance. Designed to deliver multiple sparks at lower RPM and a powerful single spark at higher engine speeds, MSD 6 Series Ignition Control Boxes help maximize horsepower, throttle response, and overall ignition stability. Whether you’re building a street-driven muscle car or a dedicated drag racing machine, upgrading your ignition system is one of the most effective ways to improve engine performance and reliability.

    A high-performance ignition control box ensures a more complete fuel burn, which translates to smoother idle quality, quicker acceleration, and reduced misfires under load. For modified engines with increased compression ratios, aggressive camshafts, or forced induction, a robust ignition system is essential.

    Performance Benefits & Key Features

    MSD 6 Series Ignition Control Boxes are engineered to provide capacitive discharge ignition (CDI), delivering high-voltage spark output and consistent performance across the RPM range. Performance enthusiasts often evaluate ignition systems based on spark energy, rev limiter capability, wiring compatibility, and durability. The multiple spark discharge feature enhances combustion at lower RPM, improving drivability and fuel efficiency in street applications.

    These ignition control boxes are built with rugged housings to withstand vibration, heat, and demanding driving conditions. Adjustable rev limiting functions help protect engines from over-revving, making them ideal for both street performance and competitive racing environments. Improved spark intensity supports stronger combustion in high-compression and boosted engine combinations, contributing to enhanced torque capacity and throttle response.

    MSD 6 Series units are commonly used in street performance builds, drag racing cars, circle track applications, and classic muscle car restorations seeking modern ignition reliability.

    Fitment, Compatibility & Applications

    MSD 6 Series Ignition Control Boxes are compatible with a wide range of GM, Ford, and Mopar engines when paired with appropriate distributors and ignition components. Popular applications include Chevrolet Camaro, Chevelle, Ford Mustang, Dodge Challenger, and various small block and big block V8 platforms.

    Designed to integrate with aftermarket distributors and performance coils, these ignition systems provide flexibility across carbureted and select EFI applications. Proper installation ensures seamless compatibility and optimal performance gains.

    If you’re ready to strengthen your ignition system and unlock consistent high-RPM power, explore the MSD 6 Series Ignition Control Boxes at JEGS and equip your build with proven ignition technology trusted by performance enthusiasts worldwide.

Part TypeIgnition Box
Product LineMSD 6-Series Ignition Control Boxes
BrandMSD IGNITION
Part CategoryPerformance Parts
Part FitmentSemi Universal
Package Qty1
Package TypeEA
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Digital 6AL Ignition Kit with Digital 6AL Ignition Control

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Digital 6AL Ignition Kit with Digital 6AL Ignition Control

Part Number : 121-64253K
$39994
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