7.25 12-1X Crank Trigger Kit GM LS Hall Effect

The Holley 7.25 12-1X Crank Trigger Kit with GM LS Hall Effect sensor delivers precision ignition timing control for LS-series engine builds. This Hall Effect crank trigger system replaces traditional points-based ignition with magnetic pickup technology, eliminating timing drift and carburetor synchronization headaches common to carbureted engine conversions. The kit packages everything needed for a clean LS conversion on engines running 7.25-inch diameter balancers.

The system includes a trigger wheel matched to the 7.25-inch balancer, Hall Effect pickup sensor, mounting bracket, and installation hardware. Hall Effect technology detects tooth passage without wear, maintaining repeatable signal quality across extended engine operation and high RPM ranges. The sensor output integrates directly with modern ECU platforms and standalone ignition controllers, providing the solid state reliability required for forced induction and high-boost applications where ignition timing precision prevents detonation and maximizes power output.

Engine builders performing LS swaps into carbureted platforms rely on this kit to eliminate mechanical governor limitations and achieve true programmable timing control. The 7.25-inch balancer diameter specification ensures fitment on stock and aftermarket LS balancers common to street and competition builds. Installation requires basic mechanical skill and familiarity with LS engine bay layout, with the trigger wheel secured to the balancer snout and the pickup positioned at factory specification for accurate tooth sensing.

This crank trigger solution occupies the intersection between traditional carburetor ignition systems and full fuel injection conversion complexity. Builders seeking carbureted LS performance—without ECU and fuel system integration—standardize on Hall Effect crank triggers for their signal reliability, cost efficiency, and compatibility with aftermarket standalone ignition modules and programmable distributors.