4000 miles on this 12 valve 5.9 engine. Hamilton 188/220 Steel Cam and their lifters. I thought I had been hearing some valvetrain noise so I adjusted the valve clearance. I did find many at .013/.014 and .023/.024. They are all now at .010/.020. However their is still "to my ears" way too much valvetrain noise. Is this a "feature" of an aftermarket cam? And it is way more prevalent to my ears than the video catches.