Holley's EFI crank trigger kit delivers an accurate crank speed and position signal to Holley EFI systems in high horsepower racing applications, measuring crank position every 10 degrees versus every 45 degrees on a standard 4-magnet MSD-style trigger. It's built for Small Block Ford applications using a standard ATI or Fluidamper-style balancer up to 7-1/4" in diameter.
Specifications:
- Application: Small Block Ford
- Trigger Wheel: 7.25" diameter, 1/4" thick billet steel, 36-1 tooth, Black Zinc Oxide finish
- Sensor Brackets: Billet 6061-T6 aluminum, black anodized
- Sensor: Custom 3-wire ferrous-target Hall-effect, M12x1mm threads for gap adjustment
- Hardware: Grade 8 / Mil. Spec mounting hardware included
- Part Number: 556-115
Will not work on balancers without a center-hub extrusion (e.g., Innovators West).
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 balancers does this crank trigger kit work with?
Standard ATI or Fluidamper-style balancers up to 7-1/4" in diameter with a center-hub extrusion. It will not work on balancers without one, such as Innovators West units.
How much more accurate is this than a standard 4-magnet trigger?
The 36-1 tooth wheel reads crank position every 10 degrees, compared to every 45 degrees on a standard 4-magnet, MSD-style crank trigger.
Is this legal for street use?
No. This part is legal for sale and use on Racing Use Only Vehicles only — see the compliance note above.
What's included in the kit?
The billet steel 36-1 tooth crank wheel, billet aluminum sensor mounting brackets, a Hall-effect sensor, and Grade 8/Mil. Spec mounting hardware.
