MSD - 6421
$530.14 / unit
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Ignition Control Module

6AL-2 Series Multiple Spark Ignition Controller

6AL-2 Series Multiple Spark Ignition Controller; w/2-Step Limiter; 4/6/8 Cylinder; Red;


  • Color: Red
  • Current Draw: .7 Amp per 1000 RPM
  • Primary Voltage: 535
  • RPM: 12500
  • Secondary Voltage: 45000
  • Spark Duration: 20 Degree Crankshaft Rotation
  • Spark Energy: 135 mJ per spark
  • Voltage: 12-18 V; Negative Ground
  • WARNING CA Proposition 65: Yes
  • WARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm -


  • All new housing; same reliable digital circuitry and performance
  • Built-In 2-Step Rev Control Adjustable w/Rotary Dials
  • Higher Output w/Up To 135Mj Of Spark Energy
  • Accepts Hall-effect; points and mag pickup triggers
  • Managed by an efficient digital processor

MSD is excited to announce the next generation of 6-Series ignition controls - the 6AL-2! The ignition control combines a new housing, new digital controls, and more power in a sleek package. Inside the new cast aluminum housing, youll find an advanced micro-controller that manages the built-in two-step rev-limiter. 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 trans-brake 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.

Racers never stop experimenting as they search for every way to wring out more power or handling performance to to gain an edge over the competition. The team at MSD is no different as we strive to deliver the products you need to meet your performance goals. We continue to innovate and invent components and technology that deliver performance and reliability with products that are easy to use and install. Over the course of 40-plus years, MSD Performance has been driving the development of innovative components that helped shape the way our cars race and perform. From super speedways to road courses, land speed racing to top fuel dragsters, and of course your traditional hot rod, MSD has provided the components to fire nearly anything in motorsports. Early on, MSD focused squarely on ignition systems with revolutionary products like the multiple sparking CD ignition, timing and rev controls, billet aluminum distributors and the Pro-Mag, an incredible breakthrough in power and endurance. Today MSD is developing electronics for your entire powertrain. The Atomic EFI systems for the LS engine platform and throttle body are now complemented with a transmission controller. Our DynaForce Starters and Alternators ensure that your engine cranks over to fire up and the Alternators keep it charged. MSD is poised to deliver components that work and communicate together to provide performance and value.

Manufacturer Part Number

MPN: 6421


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