Holley EFI Cam Sync Kit - +.400" Raised Cam - BB Chevy H77403FXL The Detroit Locker is the

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Holley EFI Cam Sync Kit - +.400" Raised Cam - BB Chevy H77403FXL The Detroit Locker is theA cam sync signal is required to run sequential fuel injection. This tells the ECU which cylinder is cylinder #1 (or the first cylinder in the firing order as entered in the software). These kits were specifically designed to provide a "plug & play" cam position signal to Holley EFI systems, although they may be used with any EFI system which can read a digital, square wave input cam signal. They are intended for use with Big Block Chevy engines with