No. The block probably does wear some. But if it is really worn enough to lose oil pressure at the cam, the engine probably isn't worth fixing as it would require a new block.
The crank usually wears out first. On most four cycle engines the crank turns twice as fast as the camshaft.
Like the other guys said, he really needs to take the crank out and get it measured with micrometers. There probably is just too much clearance between the crank and bearings, especially the rod bearings. And there is a difference between looks good and good tight oil clearance too.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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