I relize diesel's are loud and that being the norm. But mine when I shift into 3rd or 4th and give it alot of throttle. I hear a tapping sound not real loud but kinda faint. I've adjusted the valves to proper spec but I still have this kinda tapping sound coming from the engine bay when I lug or load the engine with alot of throttle after shifting into 3rd and 4th. Is this normal for a 2nd gen cummins to be kinda excessively noisy. To the point you hear some tapping at different rpm's under various load conditions? Thanks for any help