I recently did a top end on my shovelhead. It was bored .030 over with new pistons and rings. I also used new rockershafts and arms. Also the heads were refurbished. The problem I am having is, I am getting a rapping noise, that comes and goes. And it is coming from the front rockerbox, and or cylinder. I have checked the pushrods twice and have made sure that oil is getting to the top end. If anyone has any imput on this I would like to hear from you. Thanks