[Thor1993]

rhandwor - Thanks for idea. I have the compression test on my list of things to check. I will look for valves also. (and a bad cam at the same time when I have the valve cover off.)

I am thinking hard about buying a new manifold and not waiting to get one at the junk yard also.

With the snow we have had I can't take this truck out of service so I have to plan out working on it between plowing.
Greg