Big Block Chevy w/ +600/1.0 Inch Raised Cam Height; For external, dry timing-belt, cam drive systems

Part #: 556-121

Brand: Holley EFI


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Specifically designed for use w/ JESEL and similar external, dry timing-belt, cam drive systems. Includes 3 wire hall-effect sensor (8-20 volts), anodized billet aluminum bracket, mounting hardware, mating connector, and stainless steel 1/4"-20 "flying magnet" screw w/ high-temp, rare-earth magnet.

Cam Sync Kit, +600/1.0 inch Raised Cam

Part #: 556-121
  • Length: 6"
  • Width: 3.25"
  • Height: 3.25"
  • Emissions Code: 4
  • Prop 65: No


  • Fits Big Block Chevy engines w/ JESEL and similar external
  • dry timing-belt
  • cam drive systems
  • Includes 3 wire hall-effect sensor (8-20 volts)
  • anodized billet aluminum bracket
  • mounting hardware
  • mating connector
  • and stainless steel ¼”-20 “flying magnet” screw w/ high-temp
  • rare-earth magnet
  • Unique t-nut and bracket design allows for complete sensor adjustment from the outside of the bracket with a single jam nut
  • Designed to provide a plug-&-play cam position signal to Holley EFI systems; Also compatible with any EFI system which can read a digital
  • square-wave cam input signal
  • Bracket assembly can be mounted in up to five locations to accommodate various cam-drive systems and front accessory drive configurations