Digital 6A Ignition Control Kit Chevy
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MSD IGNITIONPART NUMBER: 121-6201K

Digital 6A Ignition Control Kit Chevy

$87775
ShippingShips on Nov 02, 2026
Lowest PriceLowest Price Guarantee

Street
    Digital 6A Ignition Control Kit
  • Small Block Chevy
  • Big Block Chevy
  • Red
    Includes:
  • MSD 6A Ignition Box
  • MSD Pro-Billet Distributor
  • MSD Plug Wires
  • MSD Blaster 2 Coil
  • MSD Coil Bracket

    MSD started with a clean slate and drew up plans for an all-new housing. We kept the same footprint as the traditional 6AL but lowered the profile for a sleek look. The wiring is all routed out one end of the unit through a sealed and locking connector. This eases installation and keeps your wiring looking neat and clean.

    Inside the Digital 6A you'll find a microprocessor that monitors and controls every firing. The circuits are updated with efficient components that help the ignition produce more power while drawing less current! In fact, the new Digital 6A deliver over 530 volts to the coil with up to 135mJ of spark energy for every firing! Increased output combined with MSD's proven multiple spark series is a win-win situation!

    The new Digital 6A is supplied with the wiring harness and the components you'll need for installation. Compatible on 4, 6, or 8-cylinder engines with 12-volt negative ground electrical systems. Accepts trigger inputs from breaker points, amplifiers, and magnetic pickups.

    Highlights
  • Higher output with 530 primary volts and 135mJ of spark energy
  • Efficient components use less current to produce more power
  • Same bolt pattern as the original 6A with a lower profile housing
  • Built-in LED for system checks
  • All wires exit the same side through a locked, sealed connector

    Operating Specifications
  • Spark Energy: 135-145 mJ per spark
  • Primary Voltage: 520-540 volts
  • Secondary Voltage: 45,000 volts
  • Spark Series Duration: 20° Crankshaft Rotation
  • RPM Range: 15,000 RPM with 14.4 volts
  • Voltage Required: 12-15 volts, 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 lbs

    Kit Includes
  • MSD 6A Ignition Box 121-6201
  • MSD Pro-Billet Distributor 121-85551
  • MSD Plug Wires 121-31229
  • MSD Blaster 2 Coil 121-8202
  • MSD Coil Bracket 121-8213

    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
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 FitmentUniversal
Bracket FinishChrome
Package Qty1
Package TypeEA
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No Reviews

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Digital 6A Ignition Control Kit Chevy

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