MSD 6421 Ignition Control Module

6AL-2 Series Multiple Spark Ignition Controller; w/2-Step Limiter; 4/6/8 Cylinder; Red
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Ships on or before the next business day!
MSD is excited to announce the next generation of 6-Series ignition controls– the 6AL-2. The all new ignition control combines a new housing, new digital controls and more power in a sleek package. Inside the new cast aluminum housing you'll find an advanced micro-controller that manages the timing and rpm of the ignition. The spark output of the new box has been turned up to 535 volts of primary voltage with spark energy reaching up to 135 millijoules. The multiple sparks of the 6AL-2 burn in the cylinder for 20 degrees of crankshaft rotation to ensure complete combustion. Two more great features are the rev limits. There are two rev limiters; one for high end overrev protection and another you can activate off a clutch or transbrake to set a launch limit. This feature will help your car blast off the starting line. Adjustments are made via four rotary dials for 100 rpm increment control. The all new capacitive discharge ignition will easily connect to nearly any 12-volt negative ground distributor system.



  • 6AL-2 Series Multiple Spark Ignition Controller
  • Managed by an efficient digital processor
  • MSD-6AL-2; w/2-Step Limiter; 4;6;8cyl
  • 6AL-2 Series Multiple Spark Ignition Controller; w/2-Step Limiter; 4/6/8 Cylinder; Red;
  • All new housing; same reliable digital circuitry and performance
  • Higher Output w/Up To 135Mj Of Spark Energy
  • Holley Performance Emission Code 1: This part is legal for sale and use on Emissions Controlled Vehicles; in all 50 states; when used in accordance with the manufacturers application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle
  • Accepts Hall-effect; points and mag pickup triggers
  • Built-In 2-Step Rev Control Adjustable w/Rotary Dials


Current Draw.7 Amp per 1000 RPM
Primary Voltage535
Secondary Voltage45000
Spark Duration20 Degree Crankshaft Rotation
Spark Energy135 mJ per spark
Voltage12-18 V; Negative Ground
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: Cancer and Reproductive Harm -


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