Holley's 8-Inch 12-1X Crank Trigger Kit delivers the precise, reliable crankshaft signal a high-performance Big Block Chevrolet engine needs for electronic timing control through a Holley EFI ECU or other standalone engine management/ignition controller. The 3-wire Hall Effect sensor is easier to set up and far less susceptible to EMI/RFI noise or false signals than a distributor or VR magnetic sensor, and has no wear parts to fail.
Specifications:
- Engine application: Big Block Chevrolet
- Trigger wheel diameter: 8-inch
- Trigger pattern: 12-1X (installs as 12-1 or 12x)
- Trigger wheel: Billet 6061-T6 aluminum, 3/8" thick, powerful embedded magnets
- Sensor type: 3-wire Hall Effect
- Compatibility: Designed to work directly with ATI 917776 or 917215 balancers
- Includes: Engine-specific direct bolt-on billet aluminum pickup bracket, timing pointer
- Part Number: 556-170
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
What balancer does this kit work with?
It's designed to work directly with an ATI 917776 or 917215 degreed balancer.
Why use a Hall Effect crank trigger instead of a distributor?
The 3-wire Hall Effect sensor is easier to set up, less susceptible to EMI/RFI interference, less prone to false signals, and has no wear parts since there's no mechanical distributor.
Is this kit legal for street use?
No — it's for Racing Use Only vehicles and cannot be installed on emissions-controlled street vehicles.
