One thing I am curious about. How is the oil pressure? The sound is one I have heard before. Either really bad adjusted lifters or the inner 2 cam bearings are bad and causes a hammering type sound. I have seen the bearing mush out on the bottoms and allow the cam to be unstable and make that noise. One reason that I polish all my cams on the bearing journals. Sometimes loss of oil pressure is a sign of this.
I hope it is the first thing. Much easier to fix!
Last edited by tlowe #1716; 11/15/15 11:50 PM.
