[boxermania]

Dadofour.....

That engine and the bearings look great, the cam bearing, is past the babbitt but not bad and the last main is not bad at all, just a little polished.

Let me see if I can explain the bearing "wear" that you see:

On the cam bearing - If you draw a force vector in the direction of the force exerted by the wrap of the timing chain on the sprocket you should find that it is in the direction of the "wear"
Yes, it is due to the force of the chain on the sprocket. This is not to be considered a failed bearing, but one approaching the end of it's design life. What you see is the oil film being pushed to it's limit (over 146K miles) a little more surface area on the bearing would have added to the wear capacity.

On the last main - Think about the flywheel and its weight hanging off the crank and then the last two opposing rods/pistons "yanking" on the crankshaft back and forth in the direction, I will bet if you can visualize this, you will see that the "wear" is in the direction of the piston pull. Now I need you to visualize an ever so slight movement of the shaft at that end caused by opposing forces of the pistons pulling on the loose end of the crank. Another possible explanation would be a slight out of round condition on that saddle, but the "wear" is so slight that it doesn't support that theory.

Basically there is nothing wrong with that assembly. Micro polish the crank, throw in some new bearings and close that engine., assuming that the rod bearings are OK and the big ends are not out of round.

Now you peaked my interest, how do the cylinders look, can you see the cross hatch still? How is the wear at the top of the cylinder?