Join Date: Dec 1999
Location: Winston Salem, NC
Same thing happened after I replaced the cam in my engine. About 45 seconds into the cam break-in, a VERY loud ticking sound started. It had me very worried, since I didn't know if one of the new lifters broke, or if there was something oil related since I also replaced the oil pump. I let it run since I was breaking the cam in and it quit after about 5 minutes. If it is a loud, high-pitched ticking, it's probably just a piece of dirt stuck in one of the lifter oil inlet holes so the lifter isn't getting oil and is ticking as the plunger inside hits the bottom of the lifter housing. You could pull the lifters and clean them, or it may go away like mine did.