GM LS Cam Sensor Extension Harness AF49-1540GM LS Cam Sensor Extension Harness 49 1540 AF49 1540 36" Overall Length GM LS1 CAM SENSOR EXTENSION Aeroflow Performance LS1 cam sensor extension harness is required when converting from LS1 camshaft sensor position to the front timing case on the later LS series engines. This 36" long harness enables your harness to reach the cam position sensor in the timing cover from the original position on the rear of the engine.