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In-Store Pickup Location

MSD Digital 6AL Ignition Controllers 6425

MSD Ignition 6425 - MSD Digital 6AL Ignition Controllers
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Ignition Box, MSD 6AL, Digital CD, with Rev Limiter, Red, Each

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Brand: MSD Ignition

Manufacturer's Part Number: 6425

Part Type: Ignition Boxes

Product Line: MSD Digital 6AL Ignition Controllers

Summit Racing Part Number: MSD-6425

UPC: 085132064250

Ignition Box Output: Capacitive discharge

Circuitry: Digital

Rev Limiter: Yes

Timing Retard: None

Data Acquisition: No

CD Voltage Output to Coil: 520-540 V

Current Draw: 0.7 amps per 1,000 rpm

Spark Output (millijoules): 135-145 Millijoules

Minimum Operating Voltage: 12 V

Maximum Operating Voltage: 15 V

Length (in): 8.000 in.

Height (in): 1.875 in.

Width (in): 4.000 in.

Ignition Box Color: Red

Coil Included: No

Warranty: 1-year

Quantity: Sold individually.

CARB EO Number: D-40-43 (pdf)
To see a list of qualifying vehicles, enter CARB EO Number D-40-43

Emissions: California EO Approved

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

Advance with the digital power of your popular favorite--MSD 6AL ignitions. With less power draw and higher output, MSD moves you with "the fire to drive" in a digital powerhouse! Inside microprocessors, updated circuits and efficient components monitor and handle every firing and rev limit to produce more power while pulling less current. Don't worry; features that made their 6AL boxes your first choice remain but with improved output--more than135mJ of spark energy for every firing with 530+ volts to the coil! And, to go with the new power, a new look. These digital 6AL ignition controllers are sleek with a lower profile. Wiring is routed out one end through a sealed and locked connector and two rotary dials to set rpm limit are positioned right on top--easier installation, super easy access and a clean, neat appearance under the hood. Controllers are supplied with wiring harness and components you need for install plus, vibration mounts. Increased output and proven multiple-spark power--MSD digital 6AL ignition controllers are a definite win-win!


Questions & Answers Ask a Product Question

Is there anything else I need to install this or is there anything else I should order that would work well with it?

Asked by JACK on August 16, 2017


Thank you for your question. For most street installations, the 6425 will work with your existing distributor so additional parts are not a hard requirement. Many customers choose to also upgrade their coil to a matching MSD unit. If you choose to do so, take a look at the Blaster 2 coil, part number MSD-8202.

Summit RacingSummit Racing Answer - August 17, 2017

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I replaced the original delco distributor with an MSD 8528 and the coil with a MSD Blaster 2. If I will install a MSD 6AL may I get any improvement, more reliability or what? The car is a 1971 Firebird 350. Is it suggested in this configuration? Thank you in advance.

Asked by GIANLUCA on July 09, 2017


That is a must it's the best stuff on the market it can't be beat

MICHAEL from LA answered on July 17, 2017

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Will this work on a Chevy 350 small block in a 1972 Chevy Nova SS?

Asked by JACK on August 07, 2017



WAYNE from NC answered on August 13, 2017

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Would I be able to figure out how to install this myself with instructions included and maybe a video? Have a 72 Chevy Nova SS with a Chevy 350 SmallBlock and like to hook one of these up

Asked by JACK on August 14, 2017


Yes it's very easy to install. Just follow the simple instructions that it comes with.

BRENNAN from CA answered on August 22, 2017

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Some parts are not legal for use in California or other states with similar laws / regulations

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