Holley EFI 556-171 - 7" 12-1x Modular Crank Trigger Kit

Holley EFI 556-171 - 7" 12-1x Modular Crank Trigger Kit

7" 12-1x Modular Crank Trigger Kit

Crank Trigger Kit; For Use w/Small Block Chevy; 7 in. Dia.; 12-1 Or 12X; 6061-T6 Aluminum; Incl. Instructions/Cover Mechanical Setup/3 Wire Hall Efect Sensor;

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.

• Most Accurate Way To Trigger Your Electronic Fuel Injection - Can Be Installed As 12-1 Or 12X
• Powerful Magnets Embedded In A 3/8-Inch Thick Billet 6061-T6 Aluminum Trigger Wheel
• 3-Wire Hall-Effect Sensor That Is Not Easily Susceptible To Emi/Rfi Interference
• Engine Specific Kits Include A Direct Bolt-On Billet Aluminum Pick Up Bracket
• Rigid Mounting That Will Not Flex And Cause Timing Fluctuation
• Easy To Install Much Like Traditional Msd Crank Trigger Kits
• Included Installation Instructions Cover Mechanical Setup And Provide Step-By-Step Holley Efi Software Setup