[CMCamp]

Well, the results are in, compression test is complete. First, a recap of readings before we worked on the heads.

Left bank (psi):
Cyl 1 - 135
Cyl 3 - 135
Cyl 5 - 130
Right bank (psi):
Cyl 2 - 47
Cyl 4 - 47
Cyl 6 - 115

Now the readings I took yesterday.

Left bank (psi):
Cyl 1 - 137
Cyl 3 - 135
Cyl 5 - 125
Right bank (psi):
Cyl 2 - 135
Cyl 4 - 135
Cyl 6 - 132

Looking good, but curious that we lost some compression in Cyl 5.

I'm left scratching my head on how these valves were damaged. I haven't owned the rig long enough to know its history. The best theory I've seen is the one suggested by sclor. Perhaps at some point someone incorrectly set the valve clearances, allowing the inlet valves on 2, 4 and 6 to remain slightly open. They must have gone back in and corrected the clearances, but the damage was done.

Thanks to all for the back and forth on this. Now on to figuring out how to get the exhaust system replaced. Muffler shops up here don't want to bend pipe anymore.