Crank Trigger Wheel - BBC/LS 8in 12-1X

The Crank Trigger Wheel – BBC/LS 8in 12-1X from Holley is a precision engine synchronization component designed for high-performance big-block Chevrolet and LS-series engine builds. This trigger wheel is essential for standalone engine management systems and aftermarket fuel injection controllers that require accurate crankshaft position sensing. Whether you're converting from carbureted to EFI, building a custom engine swap, or upgrading to sequential fuel injection, this crank trigger wheel provides the timing reference signal necessary for reliable engine operation.

Featuring a 12-1X tooth pattern, this wheel has one missing tooth per complete crankshaft rotation, allowing your ECU to identify top dead center and establish a repeatable timing reference. The 8-inch diameter is optimized for mounting directly to the crankshaft balancer or front hub of BBC and LS platforms, ensuring a compact footprint that fits within typical engine bay constraints. Manufactured from high-strength steel, the trigger wheel is designed to resist runout and vibration-induced wear while maintaining tight tolerances for modern crank sensor systems.

This Holley crank trigger wheel is ideal for engine builders and enthusiasts looking for reliable performance in turbocharged or supercharged applications. The precision-machined teeth ensure consistent signal transitions across all RPM ranges, making it critical for accurate spark advance and fuel delivery. Compatible with both BBC and LS engine families, this trigger wheel is a must-have for anyone serious about engine performance.