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MSD 6421 Ignition Control Box 6AL-2 w/ 2 Step Limiter For 4 6 8 Cylinder Engines

MSD 6421
Limited Supply: only 1 remaining
Pricing: $338.95
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Red 6AL-2 Ignition Control Box W/ Built In 2 Step Rev Limiter


The 6AL-2 is the next generation 6 Series ignition control on the market.

The 6AL-2 Ignition has two rev limiters, one for high end over rev protection and another you can activate off a clutch or transbrake to set a launch limit. Adjustments are made by turning 4 rotary dials for 100 RPM increment control. Compatible with 4, 6 or 8 cylinder engines with 12 volt negative ground electrical systems.



  • All new housing, same reliable digital circuitry and performance
  • Built in 2 step rev control adjustable with rotary dials   
  • Higher output with up to 135mj of spark energy
  • Accepts Hall-effect, points and mag pickup triggers 
  • Managed by an efficient digital processor
  • The spark output of the box has been turned up to 535 volts of primary voltage
  • Multiple sparks of the 6AL-2 burn in the cylinders for 20 degrees of crankshaft rotation to ensure complete combustion 

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