sidsam

there was tapping noise coning from the Top of the Motor so i have got the entire heads redone i put new oil pump, water pump head gaskets and all new seals, timing belt and silencers. new plugs and wires.i need to know now is why there is still a taping noise as i was told that changing these things will resolve the problem. i have spent 4000 AED already and now i am just hoping that someone can give me a cheap fix for this problem thank you