7IN12-1X Crank Trigger Kit SBC Hall Effect

The 7IN12-1X Crank Trigger Kit SBC Hall Effect by Holley is the cornerstone upgrade for small-block Chevy builders seeking reliable, precise ignition timing control. Whether you're tuning a street engine, bracket racer, or high-performance crate motor, this crank trigger system replaces mechanical points with Hall Effect sensor technology, eliminating timing drift and vacuum-advance complexity. It's engineered for enthusiasts and professional builders who demand repeatable spark delivery across the RPM range.

Hall Effect sensing delivers non-contact, solid-state ignition triggering by detecting a magnetic tooth passage on the crank trigger wheel. This design eliminates point bounce, contact wear, and timing variance that plagues traditional distributors—critical when dialing in carbureted or EFI fuel systems. The 7-inch diameter trigger wheel mounts directly to your SBC crankshaft damper or balancer, providing one trigger signal per crank revolution for single-fire or waste-spark distributor operation. Holley's proven Hall sensor maintains accuracy across temperature swings and engine vibration, making it ideal for daily drivers and competition builds alike.

Small-block Chevrolet owners benefit most from this upgrade when running Holley EFI systems or MSD ignition controllers that accept Hall Effect input. Installation requires mounting the trigger wheel assembly to your existing balancer and routing the sensor wire to your ignition box—no distributor modifications needed. Weighing just 2.95 lbs and measuring 9.6 × 2.3 × 13 inches, the kit fits tight engine bays without interference. Compatible with 262–400 cubic inch SBC variants, this trigger system is essential for anyone seeking repeatable timing control and peak performance from their small-block Chevy platform.