MSD 6631 | Ignition Control Module

Part Number
6HVC-L Ignition Controller; w/Rev Limiter; Race Only
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Professional race teams have been relying on the power and endurance of our 6 HVC ignition control and will be excited to see the addition of a rev limiter! The 6 HVC-L ignition has a built-in rev limiter that will save the engine from overrev damaged caused by spins, missed shifts or driver misfortune. This means there is no need to mount an external rev control (I.e., less wiring and reduced weight)! The advanced component design and circuitry of the 6 HVC ignitions produce incredible voltage with high current output. Internally there is an efficient heat sync, solid component mounting and it's all encased in a clear epoxy. The RPM limit is adjustable with plug-in modules and the wiring is routed into NASCAR approved Deutsch style MSD connectors.



  • 550 Primary Voltage Output To Coil
  • 6-pin Weathertight Connector; Mandatory For NASCAR Use
  • Includes built-in Fast rev limiter
  • Multiple sparks for 20 degrees of crankshaft rotation
  • Must Be Used w/HVC Coil PN[8250]
  • No CARB Exemption Order Number
  • 150 Millijoules Per Spark Up To 15000 RPM
  • 6HVC-L Ignition Controller
  • 6HVC-L Ignition Controller; w/Rev Limiter; Race Only;
  • Accepts breaker points/amplifier/magnetic pickup trigger inputs
  • Clear base plate for easy tech inspection
  • MSD HVC; Pro Race w/Rev Control; Deutsch
  • Holley Performance Emission Code 4: This part is legal for sale or use on Racing Use Only Vehicles. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle
  • Built-in reverse polarity protection circuit
  • Clear epoxy potting compound for vibration protection


Primary Voltage550
Secondary Voltage40000
Spark Duration20 Degree Crankshaft Rotation
Spark Energy150 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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