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Sorry to disagree, but the first thing in old engine diagnostics is to listen to it run and accelerate up from idle in a no load condition. Then it is easier to do a quick vacuum check followed by a compression check. This will usually tell you where to look further. My experience is the first...

Bent push rods are nominally due to over revving the engine or a sudden change in RPM's. Given the governors in these trucks, I expect the bending of push rods occurs when the mighty Dual Range GMC Hydromatic finally decides to shift after lumbering up that hill and crowning over the top. What...

Number 5 is most likely valves or a burned piston. Upper cylinder cleaner is most effective for gummed up rings, but can help with valves if they are just carbonized up and not seating all the way. Given the higher compressions at each end of the block, (the end cylinders tend to run a little...

Our M220 keeps growing on me. I do wish some things were more available (like airpacks) and we were farther along with our van body restoration, but I keep telling myself we are lucky to have started off with something as complete as it was. Glad you decided to hang in there a while longer.

delos, Last engine I had rebuilt cost me $1250. It was a Chevy V8 and I hired it all done. We found it was almost the same cost to hire our engine shop to do it all as it was to pay for the machine work and rebuild kit. (about another $150 for the labor and that way I got 12 months and 12K mile...

My experience with oiling a cylinder to improve compression sufficient to start causes me to suspect valve seat leakage as a first. If the engine is having that much trouble, it would be best to run a compression test to see it was all cylinders or just one or two. I have recovered engine...