Connecting rod bolts and cam bearings

[Trainraider]

Is it really necessary to replace the connecting rod bolts?

Well, it of course say's so in the workshop manual. And it would possibly be a daft thing not to do. But it surprises me that they are single use only... After all, they should not be under big stress...

Another big question is the cam bearing codes.
The crank weight gives me O.D code of A and B on another side.
The connecting rods give me code B2 (both)
So this confuses me now, should I have two different color bearings?
Greens for the "A" side and Browns for the "B" side?

Curse my color blindness... It looks that another of the old ones is indeed green and another one brown... And they don't look all that worn out so I could be brave fool and just go with the original ones thou...

All recommendations welcome.

[AMCQ46]

they should be replaced as the design torque is supposed to take the bolt close to its elastic / plastic limit so it will yield slightly. Hence the 2nd time you take it up to the same torque you wont get the same behaviour.

[tony.mon]

They're cheap enough, and I wouldn't build an engine using used ones.
Get some new ones.