Purpose-built for Big Block Chevy engines with a +.400" raised cam height running Jesel or similar external, dry timing-belt cam drive systems, this kit delivers a plug-and-play cam position signal to Holley EFI systems and any EFI system capable of reading a digital square-wave cam input.
Specifications:
- Application: Big Block Chevy, +.400" raised cam height
- Sensor: 3-wire Hall Effect, digital square-wave output
- Bracket mounts in up to five locations for various cam-drive and accessory-drive configurations
- Compatible with Jesel and similar external, dry timing-belt cam drive systems
- Part Number: 556-120
A cam sync signal is required to run sequential fuel injection — it tells the ECU which cylinder is cylinder #1 as entered in the tuning software.
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
Why is a cam sync signal needed?
A cam sync signal is required to run sequential fuel injection; it tells the ECU which cylinder is cylinder #1 in the firing order entered in the tuning software.
What cam height is this kit designed for?
It's designed for Big Block Chevy engines with a +.400" raised cam height and an external, dry timing-belt cam drive system.
Can the bracket be positioned to clear accessory drives?
Yes, the bracket assembly can be mounted in up to five locations to accommodate various cam-drive systems and front accessory drive configurations.
Is this legal for street-driven vehicles?
No, it's legal for sale and use only on Racing Use Only vehicles that are never registered or operated on the street.
