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6 HVC-L Ignition Control Built-In Fast Rev Limiter
InfoVehicle Info Needed
MSD IGNITIONPART NUMBER: 121-6631

6 HVC-L Ignition Control Built-In Fast Rev Limiter

$85395$949.95You Save$96.00
ShippingShips on Sep 04, 2026
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Circle Track & Road Racing
    6 HVC-L Ignition Control
  • Built-In Fast Rev Limiter
  • NASCAR-Approved Deutsch Connectors
  • CARB Approval: Non-Emissions Controlled
  • Black

    WARNING FOR 6632: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

    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.

    Operating Specifications

  • Spark Energy: 150 mJ per spark
  • Primary Voltage: 550 volts
  • Secondary Voltage: 40,000 volts (tested with 6HVC Coil)
  • Spark Series Duration: 20° crankshaft rotation
  • RPM Range: 15,000 RPM with 14.4 volts
  • Voltage Required: 12-18 VDC Negative Ground
  • Current Draw: .7 amps per 1,000 RPM
  • Size: 8" L x 4" W x 2.25" H
  • Weight: 5.1 lbs

    Note: Not legal for sale or use on pollution-controlled vehicles.




  • Includes built-in Fast rev limiter
  • Must be used with HVC Coil PN 8250
  • Built-in reverse polarity protection circuit
  • 150 millijoules per spark up to 15,000 RPM
  • 550 primary voltage output to coil
  • Accepts breaker points, amplifier and magnetic pickup trigger inputs
  • Multiple sparks for 20 degrees of crankshaft rotation
  • 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

Part TypeIgnition Box
BrandMSD IGNITION
Package Height3.2
Package Width8.2
Package Length10.9
Weight4.95 PG
Part CategoryPerformance Parts
Ignition Box OutputCapacitive discharge
Rev LimiterYes
QuantitySold individually
Cd Voltage Output To Coil550 V
Spark Output (Millijoules)150 Millijoules
Part FitmentSemi Universal
Ignition Box ColorBlack
Rpm15,000
Vendor Part Number6631
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
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