I have this noise coming from the rocker box that sounds like tappets-but it isn't. I ran the engine with the cover off to see if there was enough oil getting up there, which there was, however, the noise was air coming from that breather thing in the middle of the rockers. It was very loud and pulsated with rpm. Is this supposed to be so noisy or do I have something in upside down. I just did a top end overhaul and with the gasket kit came the new filter material for that breather. Any ideas?????