The rockers aren't moving. (Thanks Jerry and Glenn). So it's on to the timing gear. Another first time job for me. The good news is I needed to change the leaky gasket on the valve cover and adjust the valves.
Last time I had a timing gear/chain problem, it was with our conversion van about 20 years ago. And although it was an '82 Chevy, I took it to a dealer to get reamed, (I mean get it fixed), since I sure didn't want to do it, and especially on a van with the engine under a cowl between the front seats. But this will be another chance for me to gain experience with my old truck, I tell myself, trying to keep a positive attitude. Now, for a look at the shop manual and an in depth search on the Stovebolt forum. But nothing will get done today, because an old buddy of mine has invited me to go see ZZ Top in St. Louis tonight.
On a less happy note, I called Andy's diesel garage this morning to get an update on my '04's Duramax mystery electrical problem with the injector control wiring that keeps falsely throwing codes and sending it into limp mode. Apparently, this is when the control module senses a problem and kicks the truck down to 10-15mph to save the other injectors from damage, and makes me "limp" home or to the nearest stop, so I can clear the code with my scanner. Andy says he still hasn't found where the short/problem is. This just ain't been my week in the truck department! Hopefully, that little ol' band from Texas will cheer me up. Thanks for ALL the help, fellas. I really don't know what I'd do without this forum.

"When I rest, I rust"
1951 3100 5 window w/ '56 235