I have a 95 F150 with a 5.0. I have a strange chirping noise in the motor. I thought it was just the belt slipping. I replaced the belt, belt tensioner and then the water pump. The noise continued. Then I removed the belt and ran the motor. The noise was still there. This eliminated all the accessories. It sounds just like a belt chirp. It sounds like it's external, no knocking or heavy metal sound. Has anyone heard of a harmonic balancer making a noise like this? Any help would be appreciated.