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#5476425
MSD 6425 6AL Digital Ignition Control Box
- Features a higher output with 530 primary volts and 135mJ of spark energy
- Efficient components use less current to produce more power
- Two rotary dials allow you to set an RPM limit
$319.45
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$354.95
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Product Summary
Capacitive Discharge Ignition Box Output, Red, Red
- Features a higher output with 530 primary volts and 135mJ of spark energy
- Efficient components use less current to produce more power
- Two rotary dials allow you to set an RPM limit
- Has the same bolt pattern as the original 6AL, but with a lower profile housing
- Integrated LED lights for system checks
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See rebate detailsKey Specs
D-40-43| MFG. Part # | 6425 |
| Brand | MSD |
| Ignition Box Output | Capacitive Discharge |
| Circuitry | Digital |
| CARB EO# |
Need To Know
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MSD 6425 Details
The MSD 6AL Ignition Control set the standards that other ignitions strive to reach. In fact, you'll find ignitions from other companies that carry the 6AL name (and in some cases, the same part number). MSD raised the bar even higher with the revised Digital 6AL Ignition Control!
The wiring of the Digital 6AL is routed out one end of the unit through a sealed and locking connector. This eases installation and keeps your wiring looking neat and clean. The rev-limiter of the 6AL is located right on top of the housing for easy access to the two rotary dials to set the limit in 100 rpm increments.
Inside the Digital 6AL, you'll find a microprocessor that monitors and controls every firing and rev limit. The circuits are updated with efficient components that help the ignition produce more power while drawing less current! In fact, the Digital 6AL delivers over 530 volts to the coil with up to 135mJ of spark energy for every firing! Increased output combined with MSD's proven multiple spark series is a win-win situation!
The Digital 6AL is supplied with the wiring harness and the components you'll need for installation. The 6AL is also supplied with vibration mounts. Both ignitions are compatible on 4, 6, or 8-cylinder engines with 12-volt, negative ground electrical systems. They'll accept trigger inputs from breaker points, amplifiers, and magnetic pickups.
Features:
- High output with 530 volts and 135mJ of spark energy
- Efficient components use less current to produce more power
- Set an rpm limit with two rotary dials in 100 rpm increments
- Built-in LED for system checks
- All wires exit through a locked, sealed connector
- Compatible with 4, 6 or 8-cylinder engines
Learn more about determining the proper MSD ignition control box for your application by reading our tech article. MSD Ignition Box: Ignition Controller Buyer's Guide
Rebates
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Save 10% instantly on select products across the Holley family of performance brands during the annual Holley I.R.S.Tax Sale. Instant rebate period has been extended and now runs from February 17, 2026 through April 19, 2026.
Guides & Documents
MSD 6425 Specifications
MSD 6425 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 6425 |
| Brand | MSD |
| Ignition Box Output | Capacitive Discharge |
| Circuitry | Digital |
| CARB EO# | |
| GENERAL | |
| Rev Limiter Included | Yes |
| Data Acquisition | No |
| RPM Range | 11,000 RPM |
| Timing Retard | None |
| Coil Included | No |
| Primary Voltage | 520-540 Volts output to coil |
| Secondary Voltage | 45,000 Volts |
| Spark Output | 135-145 MJ |
| Voltage Required | 12-15 Volts, 7 Volt Start |
| Current Draw | 0.7 Amp per 1000 RPM |
| Ignition Box Color | Red |
| GTIN Code | 085132064250 |
| Overall Length | 8.00" |
| Overall Width | 4.00" |
| Overall Height | 1.88" |
| Color | Red |
| Sold in Quantity | Each |
| Emission Code | 1 |
Ratings & Reviews
5
18 Reviews
Customers strongly endorse the product for its high quality, practicality, and ease of installation. They particularly appreciate its simplicity and functionality. The product is universally heralded for working exceptionally well right out of the box, needing minimal adjustments. It is recommended for all applications, highlighting its broad usability. The product stands out for quality, with users frequently choosing it for building their motors. Its easy-to-follow instructions and similar mounting to earlier models were also positively noted. The product is recognized as the best choice among users, with several confirming they'll purchase again, and recommend it to friends.
Ratings & Reviews
5
18 Reviews
Customers strongly endorse the product for its high quality, practicality, and ease of installation. They particularly appreciate its simplicity and functionality. The product is universally heralded for working exceptionally well right out of the box, needing minimal adjustments. It is recommended for all applications, highlighting its broad usability. The product stands out for quality, with users frequently choosing it for building their motors. Its easy-to-follow instructions and similar mounting to earlier models were also positively noted. The product is recognized as the best choice among users, with several confirming they'll purchase again, and recommend it to friends.
5
19 reviews
5
19
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Filter by Ratings
If needed I would definitely make this purchase again
5.0
11 days ago
Big Al
Fresno Texas
Verified
I rate this product very highly
Would Recommend
This is the only brand I use
5.0
9 months ago
Mach 1 Dude
Illinois
Verified
These work every time no matter which model you use
Would Recommend
Yes
5.0
11 months ago
Greg
Nebr.
Verified
Works great
Would Recommend
Love this box
5.0
a year ago
LMSS14
Sioux Falls, SD
Verified
Haven't used this one in my car yet, but have seen it in use in friends cars. Heard nothing but good things about it.
Would Recommend
I would buy this product again and again
5.0
a year ago
Quill
Pa
Verified
In all my time mess around with vehicles, I did not have a digital MSD box. I always used to use the old analog, I am convinced that the digital ones are a lot better
Would Recommend
yes
5.0
2 years ago
pags
south jersey
Verified
worked out perfectly
Would Recommend
Good value
5.0
2 years ago
Guy
Stevens point, Wi
Verified
Good quality
Would Recommend
I will buy this product again.
5.0
2 years ago
IRS
Schofield, Wi
Verified
Installed the distributor and 6AL, Hooked it up, worked out of the box! Made adjustments, up and running!
Would Recommend
Yes I would y this again!!
5.0
3 years ago
Sr. Piston
Ione,ca
Verified
Nothing went wrong, ordering was easy, shipping was great,ups, part is working great! Would definitely use speedway motors again
Would Recommend
I would highly recommend
5.0
4 years ago
Mike
Missouri
Verified
I like them for all applications
Would Recommend
Showing 10 of 19 reviews
