6M-2L Marine Ignition Control Kit for Chevy
InfoVehicle Info Needed
MSD IGNITIONPART NUMBER: 121-6560K1

6M-2L Marine Ignition Control Kit for Chevy

Color:

Black
Red
RED
$1,30140
ShippingShips on Sep 03, 2026
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Marine
    6M-2L Marine Ignition Control Kit
  • Big Block Chevy
  • Blue
    Includes:
  • 6M-2L Marine Ignition Control
  • Marine Pro-Billet Distributor
  • High-Vibration Blaster Coil
  • Super Conductor 8.5mm Wires

    The MSD 6M-2L Ignition Control is designed for performance marine applications where a high energy and reliable ignition is a necessity. The capacitive discharge design of the MSD produces full power sparks throughout your boat's entire rpm range. Below 3,000 rpm, a series of multiple sparks burn in the cylinder for 20° of crankshaft rotation ensuring complete combustion. Together, these sparks produce easier starting, great throttle response, more power and reduced plug fouling during idling. Weathertight connectors securely lock together to provide reliable connections that are unaffected by water, oil, gasoline and most other chemicals associated with boats. The 6M-2L's electrical circuitry is potted with a polyurethane compound. This material prevents the electrical components from coming into contact with water or other chemicals. The 6M-2L also features a built-in Soft Touch Rev Control that will save your engine from overrev damage. The rpm limit is set with sealed rpm modules. The 6M-2L can be triggered by either a magnetic pickup (distributor or crank trigger), amplifier or by a breaker point distributor. The cable harness has the proper connector so you can plug the 6M-2L into one of the Pro-Billet MSD Marine distributors.

    Highlights
  • Designed for performance marine applications
  • 4000, 6000, and 8000 RPM modules included
  • Weathertight connector with multi-ribbed seal for reliable connection unaffected by water, oil, gas, and most other boating chemicals
  • Completely potted circuitry with polyurethane for weather-proof protection
  • Cable harness has proper connector so you can plug the 6M-2L into an MSD Pro Billet Marine Distributor
  • Triggered by magnetic pickup (distributor or crank trigger), breaker points distributor, or amplifier
  • Tested by Underwriter's Laboratory and certified to meet or exceed USCG standards

    Operating Specifications
  • Spark Energy: 105-115 mJ per spark
  • Primary Voltage: 460-480 volts
  • Secondary Voltage: 45,000 volts (tested with Blaster Coil)
  • Spark Series Duration: 20° crankshaft rotation
  • RPM Range: 15,000 RPM with 14.4 volts
  • Voltage Required: 12-18 volts (negative ground)
  • Current Draw: 1 amp per 1000 RPM
  • Size: 8" L x 3.5" W x 2.25" H
  • Weight: 3.5 lbs

    Kit Includes
  • 6M-2L Marine Ignition Control 121-6560
  • Marine Pro-Billet Distributor 121-8560
  • Red Blaster SS Coil 121-8207
  • Super Conductor 8.5mm Wires 121-35609

    Emissions Note:

    This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

    CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

    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 Height2.65 in (67.31 mm)
Package Width2.23 in (56.642 mm)
Primary Resistance0.355 ohms
Housing FinishNatural
Housing Materialbillet aluminum
Ignition Box RequiredYes
Spark Plug Boot EndsEight 90 degree
Peak Current300 mA
Computer-Controlled CompatibleNo
Rfi SuppressionYes
Gear MaterialIron
Coil Internal ConstructionEpoxy
Advance TypeMechanical
Diameter (Mm)8.5
Distributor Boot MaterialSilicone
Marine UseYes
Coil StyleE-core
PositionN/A
ColorRED
Wire ColorRed
Ballast Resistor IncludedNo
Spark Plug Boot MaterialSilicone
Coil Wire IncludedNo
Trigger StyleMagnetic
Part CategoryPerformance Parts
Carb Eo NumberD-40-37 (pdf)
Distributor TypeHEI/Breakerless
AssembledYes
Engine Make/SizeChevy Marine V8
Turns Ratio70:01:00
Spark Plug Boot ColorGray
Mounting Bracket IncludedNo
Inductance6.9 mH
Distributor Terminal EndsMale/HEI
Distributor Boot ColorGray
Secondary Resistance4.40K ohms
Slip CollarNo
Mechanical Tach DriveNo
Boot Type90 Degree
Coil Wire AttachmentMale/HEI
QuantitySold as a set
Overall Length3.5 in (88.9 mm)
Maximum Voltage40,000 V
Coil ShapeSquare
Coil ColorRed
Spark Duration220 uS
Distributor Gear RotationStandard
Conductor StyleSpiral core
Cap StyleMale/HEI
Part FitmentSemi Universal
Package Qty1
Package TypeEA
No Questions
No Reviews

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