Description
Check the specifications, dimensions, variation details, referenced part numbers, and available fitment evidence before matching this item to an application.
Brand: MSD
| Manufacturer |
MSD Ignition |
| Brand |
MSD |
| Model |
MSD Ignition 6425 6AL Ignition Control Box , Red |
| Item Weight |
3.08 pounds |
| Product Dimensions |
9.45 x 2.36 x 9.45 inches |
| Item model number |
6425 |
| Is Discontinued By Manufacturer |
No |
| Exterior |
Machined |
| Manufacturer Part Number |
6425 |
| OEM Part Number |
6425 |
Built-In Adjustable Rev-Limit Control;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;
No structured vehicle fitment data is available. Compare the listing with the vehicle and existing part before ordering.
Parameters, dimensions, material, fitment, and part numbers
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A control units listing with source specifications kept visible for comparison.
Fit and size notes
- No structured vehicle fitment was supplied; verify the product details against your application.
Specification notes
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- Compare the listing title, photos, package contents, and specifications with the part being replaced.
- Confirm vehicle compatibility and installation requirements before ordering.
Customer feedback
Ratings and written reviews
4.6 / 5
527 source ratings
Source: Amazon. Imported marketplace feedback is shown for product research and is not a review of a purchase made on this website.
Catalino –
I received DOA MSD control boxes from Amazon, however the third box I received finally did the trick! At first, I believe it was the installation or how my car was pre-wired, however after calling MSD and troubleshooting with them, I was convinced it was the MSD box. I have a smoother ride, more power/torque felt in the low/mid range, starts easier and faster (it already started great, but you can feel/hear the difference with the digital 6AL). Gas mileage, surprisingly, increased. Well worth the investment.My car is a 1973, Datsun 240Z with triple weber carbs, headers, and pertronix 1 elec. ignition. Please note I changed my Pertronix Coil to an MSD coil during troubleshooting before realizing the Box was the culprit, so not sure, but I doubt if the Pertronix coil is compatible with the 6AL.
HD TOW TRUCK OPERATOR –
I installed this in my 98 ram 1500 318before install i had a slight timing issue my tdc (top dead center) was close to 0 almost every time and the idle jumped from 585 to 686 i did plugs wired cap rotor and still nothing….i changed my coil with an accl coil it greatly helped but not perfect, then i saw this bad boy bought it and the adaptor for the mopar coil.. wired it up in about 2 hours or so set the rev limiter (very important you get the ones with a rev limiter or u may damage your engine) and fired it up instantly noticed a stronger start and an increase in acceleration and torque probably the best mod i have ever dont tho this truck excellent part
John J. Beatrice –
I bought this unit to replace a 6420 which went bad on me. This model is digital, and replaced the defective unit perfectly. My 64 Corvette is now back on the road. I have a MSD distributor with a mechanical tach drive so setting the rev-limiter is still a mystery to me. The installation directions indicate how to set the rev-limiter with an MSD or electronic tach. I would give them five stars but product support could not help with my old one. They wanted me to send it in for a diagnosis. I know from past experience that service takes a couple months to get an item back. I didn’t want to give up the rest of summer so I bought another unit.
Marco Garcia –
Quality Duraspark ignition upgrade for my 1988 Jeep YJ Wrangler 4.2L. Lots of YJ owners go with an HEI distributor but I preferred to keep my original Duraspark distributor and use the Digital 6AL MSD Ignition because it is much better quality with more features and benefits. Some of those include, multiple spark, built in adjustable rev limiter, powerful spark at higher RPMs, lower voltage needed for cranking and extras like the capability of later adding the Adjustable Timing module if you find the need to retard/advance on the fly. If you’re really serious about your Jeep and want a top notch ignition, look no further the MSD 6425 is the perfect box for your ride.
neekamv8 –
I have fitted these units ( mostly as a kit from Steelwings which includes the 6AL, MSD coil and MSD distributor ) onto several Vintage Aston Martin V8s ( mid 70s to mid 80’s vintage ) and they improve idle dramatically and greatly improve overall drivability. Great piece of kit..
Marco –
solo funciono un poco mas de un mes y fallo
Paul –
arrived in one day. great price
todd –
Works well msd best product
Roberto C. –
Muy buen producto recupera entre 10 y 15 caballos, las conexiones simples y de muy buena calidad vale la pena la inversión para actualizar el encendido de un clasico
Amozon shopper. Researcher of everything. –
I mean these have been around for a long time and have been proven to be worthy.
Michael Simms Jr –
It gave my 1992 302 Ford F150 a more immediate response in terms of acceleration. Be sure to time your engine your after installing the box. The MSD box causes it to retard by a few degrees. Be sure to order the 8874 wiring harness if you also own an f150 of that generation to save yourself from splicing wires.
daveyboy700 –
Wired it up and the car started. Everything you need is included but you may want a mounting bracket depending on where you want to put it.
Jeff weller –
As described