Digital 7-Plus Programmable Ignition Control Kit Small Block Chevy

Name: Digital 7-Plus Programmable Ignition Control Kit Small Block Chevy
Brand: MSD IGNITION
SKU: 121-7531K
Price: 2105.80 USD
Availability: InStock

^$2,105⁸⁰

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Ships on Nov 02, 2026

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Digital-7 Plus

Small Block Chevy
Big Block Chevy
Includes:
Ignition Box
Distributor
Coil
Coil Bracket
Plug Wires

The Programmable Digital-7 Plus is the ignition includes all of the standard programmable features such as Individual Cylinder Management/Step Retards/Rev Limits/Shift Points and more are included in the Plus version but you also get more. Much! A MAP sensor is required for the boost circuit. The ignition is supplied with wiring harnesses, mounting hardware, an RS232 computer harness and the Pro-Data+ software.
No Timing Compromises - Ignition timing is always a compromise between cylinders. The dynamics of the flow of air and fuel into each cylinder is never exactly the same no matter how much machining magic has been done. This has always caused top engine builders to compromise their ignition timing. With the Programmable Digital-7's advanced Individual Cylinder Management system and other exact timing programs you will never need to compromise again.
ICM Timing Control: Adjust the ignition timing in each cylinder! Program up to 5° of timing retard into each individual cylinder in 0.1° increments.
Run Curve: Plot a timing curve in 0.1° per 100 rpm throughout the entire rpm range of your engine
Launch Curve: Program a timing curve exclusively for the launch! If the starting line conditions are less than adequate, you can set a completely different curve for the launch!
Launch Retard: Retard the timing up to 15° for 0-2.5 seconds after you launch the car.
Step Retards: Three steps of retard that can be activated with nitrous solenoids or switches.
Gear Retards: Program a timing retard up to 5° with every gear change!
Start Retard: Ease engine cranking with an adjustable retard during start up.
Power - No other ignition system comes close to matching the output power and the Individual Cylinder Management timing system of the Programmable Ignition. To effectively handle all of the ignition's tasks, a 15mHz microcontroller, reviews, manages and analyzes every trigger signal up to 15,000,000 instructions per second! Capacitive discharge circuits combined with an IGBT Coil driver deliver incredible cylinder pressures. Below 3,300 there is of course MSD's powerful series of multiple sparks. This spark series burns in the cylinder for over 20° of crankshaft rotation resulting in improved combustion for a smooth idle, great throttle response and increased power.

RPM Controls - Monitoring the engine's rpm allows you to set shift light points, activation points and rev limits. The Programmable Digital-7 Plus has MSD's proven Soft Touch rev limiting controls built in and lets you program several rpm features.
Three Step Rev Control: Program rev limits in 100 rpm increments for burnout, launch and overrev protection.
Shift Light: Program a different rpm setting for each gear change for up to six gears.
RPM Activated Window Switch: Activate a circuit at an adjustable rpm such as a nitrous solenoid, then set another rpm level to deactivate the same circuit.
Other features include:
Map a complete timing curve for every gear.
Stage retards can be set to ramp the timing.
Updated X-Y plots with interpolation for smooth changes.
View all ignition events in a new Launch History window including the retard sum, manifold pressure, RPM, shift points and more.
Select the RPM limiter value in RPM/Seconds.
Vacuum advance and boost retard is selectable through a MAP sensor.
There is a cam sync output for fuel controllers or data acquisition.
Program your engine's firing order for ease of setting the cylinder-to-cylinder timing.
Automatic magnetic pickup compensation for crank triggers or distributor pickups.
Output to activate a device through RPM, time or pressure inputs.
An upgraded microcontroller runs at 40mHz enabling timing accuracy within 0.1° and +/- RPM at up to 10,000 RPM

Kit Includes:
MSD Digital 7-Plus Ignition Box 121-7531
MSD Distributor 121-85551
MSD HVC-2 Coil 121-8261
MSD Plug Wires 121-31229

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

No Timing Compromises

Ignition timing is always a compromise between cylinders. The dynamics of air and fuel flow into each cylinder is never exactly the same no matter how much machining magic has been done. This has always caused top engine builders to compromise their ignition timing. With the Programmable 7-Series Race Ignition Boxes advanced Individual Cylinder Management system and other exact timing programs, you will never need to compromise again.

When you need race-proven ignition performance that won’t let you down, the MSD 7-Series Race Ignition Boxes are built to deliver. Engineered for serious competitors, these ignition systems offer unmatched spark energy, advanced features, and rugged construction to handle the harshest racing conditions.

The MSD Digital 7 ignition box delivers ultra-fast processing power and precision timing control, making it the ideal choice for high-horsepower drag, circle track, and off-road applications. With programmable RPM limits, timing curves, and data acquisition capabilities, this unit gives racers the ultimate edge in tuning and customization.

For those looking for legendary performance in a straightforward design, the MSD 7AL-2 remains a favorite in the racing community. It’s known for delivering a powerful capacitive discharge spark throughout the RPM range while providing built-in rev control and compatibility with MSD’s RPM modules for quick adjustments at the track.

The MSD 7-Series line stands apart with its durability, consistent output, and seamless integration with other MSD components. Whether you're pushing big boost, nitrous, or high compression, these ignition boxes provide the spark intensity and reliability needed to keep your engine firing strong—pass after pass.

Built for racers who demand precision and power, the MSD 7-Series Race Ignition Boxes are the backbone of countless winning setups. Trust MSD to ignite your competitive edge and help you dominate the race day.

Part TypeIgnition Box

Product LineMSD 7-Series Race Ignition Boxes

BrandMSD IGNITION

Part CategoryPerformance Parts

Part FitmentUniversal

Package Qty1

Package TypeEA