So, a couple months ago I was driving from North of Seattle Washington about 3hrs to Portland OR to pickup a 2door Tahoe at a buddy's house that I had purchased. About half way down to Portland while in stop and go traffic my flatbad started making a knocking noise. The noise was loud at first then quited down some. Made the trip Tahoe in toe back home. The noise went away for the majority of the trip back, started back up again about 20 miles from home. I swapped some injectors out with the problem still persisting. Came to the conclusion that it must be valve train noise. Pinpointed the suspected cylinder #4, removed that valve cover and rocker assembly and lifter. Here is what I found.
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