Crank Trigger Kit Flying Magnet Hall-Effect LS Gen Iii/Iv 6.56 In. Small Block Chevrolet Gen Iii/Iv Adjustable Timing Pointer Red MSD IgnitionOn some vehicles the MSD Crank Trigger Kit may require slight modifications to accommodate special engine plates, pulley systems, etc. This kit is designed to be used with the ATI Harmonic Balancer 917776 or 917215. Also compatible with Meziere water pump WP333 and LSX Blocks. Upgrading to an MSD Flying Magnet Crank Trigger Kit will deliver the precise and reliable signal that a high performance engine requires. This kit gives you the ability to