Professional race teams rely on the power and endurance of the MSD 6 HVC Ignition Control. Its advanced component design and circuitry produce incredible voltage with high current output, backed by an efficient internal heat sink, solid component mounting, and a clear epoxy potting compound for vibration protection. The rev limit is adjustable with plug-in modules, and wiring routes into NASCAR-approved Deutsch style MSD connectors.
Specifications:
- Product Type: Ignition Box
- Color: Black
- Primary Voltage: 550V / Secondary Voltage: 40,000V
- Spark Energy: 150 mJ per spark
- Maximum RPM: 15,000 RPM (at 14.4V)
- Voltage Required: 12-18V, Negative Ground
- Spark Series Duration: 20° crankshaft rotation
- Rev Limiter: Built-in Fast Rev Limiter
- Weight & Size: 5.1 lbs., 8"L x 4"W x 2.25"H
- Part Number: 6631
Must be used with MSD HVC Coil PN 8250; accepts breaker points, amplifier, or magnetic pickup trigger inputs and uses a 6-pin weathertight connector required for NASCAR use.
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
Is the MSD 6631 legal for street use?
No. It carries Emission Code 4, meaning it's legal for sale and use only on Racing Use Only vehicles — competition vehicles that are never registered or operated on the street.
What rev limiter comes on the 6 HVC?
It includes a built-in Fast Rev Limiter, adjustable with plug-in modules, which is quicker and more accurate than MSD's Soft Touch rev limiter.
What coil does the 6 HVC require?
It must be run with MSD's HVC Coil, PN 8250, to reach its rated 550-volt primary output and 150 mJ spark energy.
What connector does the 6631 use?
It uses a 6-pin weathertight Deutsch-style connector, which is mandatory for NASCAR-sanctioned racing.
