Holley EFI 7" 12-1x Modular Crank Trigger Kit, SBC, Hall Effect

These systems are designed to provide an engine speed and position signal to most EFI systems, with control being enabled by the ECU (not included). The kit’s 3/8”, 11, or 12 magnet wheel will provide an accurate crankshaft speed and position signal to the ECU in the most-demanding of racing applications. These kits were designed specifically for use on early model Small Block Chevy applications equipped with a standard, aftermarket ATI Super Damper or Fluidampr “style” harmonic balancer. The 7” trigger wheel included with these kits was designed to center off of the hub of the balancer and therefore, does not require a centering ring for wheel centering. Consequently, these kits will not work on balancers which do not have a center-hub extrusion (i.e.: Innovators West, etc.). In addition, these wheels will only work with balancers having a 3-hole, wheel mounting bolt-pattern. On some vehicles the Crank Trigger Kit May require slight modifications to accommodate special engine plates, pulley system, etc.

With the included high quality timing pointer and the use of a direct bolt-on, degreed balancer (see below list for recommendations), you'll be able to adjust timing in the precise increments required for your engine. Coyote 556-173: We recommend using ATI 918047-MSD but will also work with 918047N and 918047NA. LS 8" 556-174: Designed to work directly with ATI 917302, 918852, 917264 or 917242. LS 7.28" 556-175: Designed to work directly with ATI 917777, 917211 or 917234. LS 6.56" 556-176: Designed to work directly with ATI 917776 or 917215.

Features:

• 3-wire Hall Effect Sensor
• Screw in type for easier installation
• Less susceptible to EMI/RFI interference/noise
• Included are bracket, mounting hardware, and hall-effect sensor