Each distributor is CNC-machined from billet aluminum creating a strong foundation. The caps are MSD designed and molded from Dupont® Rynite TM material for great strength and resistance to spark scatter. A great new feature is the two piece adjustable rotor that is supplied. This assists in setting up the proper rotor phasing for accurate timing and spark control. This Pro-Billet Distributor from MSD features an adjustable cam sync pickup as well as a magnetic pickup inside the distributor to trigger the ignition control. The Hall-effect sync pickup is adjustable up to 60° BTDC to meet the needs of most aftermarket ECUs and even is crimped with a 2-pin Weathertight connector. If you plan on using an aftermarket EFI system that fires sequentially, you'll need to provide the ECU with a cam synchronization signal. The ECU requires to know when cylinder number one is firing (or preparing to fire) so it knows the sequence of the injectors coming next.