The Holley 6.56-Inch 12-1X Crank Trigger Kit gives Small Block Ford engines a precise, reliable crankshaft signal for electronic timing control through a Holley EFI ECU or other standalone ignition/engine management system. The billet aluminum trigger wheel and 3-wire Hall-Effect sensor resist EMI/RFI interference and outlast distributor or VR magnetic sensor setups, and the kit includes a direct bolt-on billet pickup bracket and timing pointer.
Specifications:
- Diameter: 6.56-inch
- Engine Application: Small Block Ford
- Sensor Type: Hall Effect
- Trigger Wheel Thickness: 3/8 in
- Material: Billet Aluminum
- Color: Silver
- Part Number: 556-172
Use with a direct bolt-on, degreed balancer sized for this trigger wheel.
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's included in this kit?
A 6.56-inch 12-1X billet aluminum trigger wheel, direct bolt-on billet pickup bracket, 3-wire Hall-Effect sensor, and a timing pointer.
What engines is this kit for?
Small Block Ford applications using a direct bolt-on, degreed harmonic balancer.
What sensor type does it use?
A 3-wire Hall-Effect sensor that resists EMI/RFI interference and is less prone to mechanical failure than distributor or VR magnetic sensor triggers.
Is this part legal for street use?
No. It is legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.
