I'm getting this irregular metallic tapping sound from the front end of the block. Its not regular enough for a lifter although it does seem to go away once the car is warm. I thought it was the water pump but I just changed that and the noise is still there. Doubt its the timing chain/guides as they are pretty new too. The belts are in good condition. There is plenty of spring in the belt tensioners. There is a TINY amount of play in the tensioner pulleys. Tried the screwdriver stethoscope but just cant nail it down. Next step is going to be whip the belts off again and run it to see if that narrows it down. Any other suspects/ideas plse?