Digital 6-Plus Ignition Control Kit for Chevy
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MSD IGNITIONPART NUMBER: 121-6520K

Digital 6-Plus Ignition Control Kit for Chevy

Color:

Black
Red
RED
$1,17156
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Performance
Digital 6-Plus Ignition Control Kit
  • Small Block Chevy
  • Big Block Chevy
  • Red
  • Includes:
    • Pro-Billet Distributor
    • Digital 6-Plus Ignition Control
    • Red MSD Blaster 2 Coil
    • Coil Mounting Bracket
    • Red Universal 8.5mm Wire Set

      Includes:
    • Pro-Billet Distributor 121-85551
    • Digital 6-Plus Ignition Control 121-6520
    • Red MSD Blaster 2 Coil 121-8202
    • Coil Mounting Bracket 121-8213
    • Red Universal 8.5mm Wire Set 121-31229
    • 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.

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      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
    Package Height6 in (152.4 mm)
    Primary Resistance0.700 ohms
    Housing FinishNatural
    Housing Materialbillet aluminum
    Ignition Box RequiredYes
    Spark Plug Boot EndsEight 90 degree
    Peak Current140 mA
    Computer-Controlled CompatibleNo
    Rfi SuppressionYes
    Gear MaterialIron
    Coil Internal ConstructionOil-filled
    Advance TypeMechanical
    Diameter (Mm)8.5
    Distributor Boot MaterialSilicone
    Marine UseNo
    Coil StyleCanister
    PositionN/A
    ColorRed
    Wire ColorRed
    Ballast Resistor IncludedNo
    Spark Plug Boot MaterialSilicone
    Coil Wire IncludedNo
    Trigger StyleMagnetic
    Part CategoryPerformance Parts
    Hardware IncludedNo
    Carb Eo NumberD-40-37 (pdf)
    Distributor TypeHEI/Breakerless
    AssembledNo
    Engine Make/SizeChevy Small Block (262-400)
    Turns Ratio100:1
    Spark Plug Boot ColorGray
    Mounting Bracket IncludedNo
    Inductance8.0 mH
    Distributor Terminal EndsMale/HEI
    Distributor Boot ColorGray
    Secondary Resistance4.70K ohms
    Slip CollarNo
    Mechanical Tach DriveNo
    Bracket MaterialSteel
    Diameter2.125 in (53.975 mm)
    Boot Type90 Degree
    Coil Wire AttachmentFemale/Socket
    Distributor Cap ColorRed
    QuantitySold as a set
    Maximum Voltage45,000 V
    Coil ShapeRound
    Coil ColorRed
    Spark Duration350 uS
    Distributor Gear RotationStandard
    Conductor StyleSpiral core
    Cap StyleMale/HEI
    Part FitmentSemi Universal
    Bracket FinishChrome
    Package Qty1
    Package TypeEA
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