Chevy Cam Sync Distributor, Hall Effect, Large Cap Hall-Effect Sync Pickup. Must Be Used With An 6, 7 Or 8-Series MSD IgnitionSome aftermarket EFI management systems fire the fuel injectors in the same order as the engine's firing order. These are called synchronization systems and are found in most high performance applications. These systems require a sync signal to know when the number one cylinder is firing. These MSD Distributors feature an adjustable cam sync pickup so you can set it to your ECU's requirements (up to 60 Degree BTDC). Each model is equipped with a slip