The engine had a lifter tick when I assembled the truck before paint. This engine had a lot of miles, somewhere just under 180K if I remember right, but it never used any oil and it was always a strong runner. We pulled it apart to find the problem. The cam has clearly seen better days. However, the cylinder walls are in surprisingly good shape. You can still see the cross hatch from the original honing.
We ordered a stock rebuild kit and a mild RV cam that is reportedly compatible with the SD computer. Once we get this back together we will be able to start the final assembly.