Thought you guys might find these pics interesting. I blew a headgasket on my 05 duramax and am in the middle of tearing it apart. Got the heads off today and took some pics. Apparently the star pattern on the top of the pistons is the injector spray pattern. When it goes back together all the emissions junk is coming off. I'll take some pics later showing how much sludge it builds up in the intake manifolds.