MSD 6425 Digital 6AL Ignition Control Module with Rev Limiter - Red

The MSD 6425 Digital 6AL Ignition Control is a high-performance multiple spark discharge ignition box engineered to deliver stronger, more consistent spark energy across a wide RPM range. Built on MSD's legendary 6AL platform, this digital ignition control offers improved accuracy and reliability over analog predecessors, making it a favorite upgrade for street performance, bracket racing, and weekend track use.

At the heart of the 6425 is a powerful capacitive discharge system capable of producing 530 volts and 135 millijoules (mJ) of spark energy, ensuring complete combustion even under high-compression or forced-induction conditions. Its efficient digital circuitry draws only 0.7 amps per 1,000 RPM, reducing electrical load on the charging system while delivering more usable power to the ignition.

Key Features:

• 530V / 135mJ output — high-energy capacitive discharge spark for maximum combustion efficiency
• 0.7 Amp draw per 1,000 RPM — efficient design reduces strain on the charging system
• 12–15V operating range with 7V start capability — reliable firing even during low-voltage cranking
• Built-in rev limiter — two rotary dials allow precise RPM limit adjustment in 100 RPM increments
• Compatible with 4, 6, and 8-cylinder engines — versatile fitment across a wide range of applications
• Built-in LED indicator — provides quick visual system status and diagnostic checks
• Locked, sealed connector — all wires exit through a single weatherproof connector for a clean, protected installation
• Digital circuitry — improved timing accuracy and resistance to electrical interference versus analog designs

The MSD 6425 installs in line with your existing ignition system and is compatible with most points-type, electronic, and distributor-based ignition setups. The iconic red billet aluminum housing is durable and heat-resistant, designed to withstand underhood temperatures in demanding performance environments.