Main Bearing Shells

[PennoK3]

I have a 550 K3 engine for rebuild.   I have all the original shells, one crankcase half has them in place the others are loose. They all look in good shape but there doesn't appear to be any code on the cases.   Any tips for sorting this out please?

[Bryanj]

you are stuffed mate unless you can determine the colour codes on the sides

[PennoK3]

Many thanks guys

[PennoK3]

You look at things for ages and just can't see!!!  On the rear of the crankcase in big letters is crudely stamped C C B F B, could this be the shell code? but not sure the relevance of the F?

[PennoK3]

Looking at it again it almost looks like a P so I'm thinking it could be a badly done B.   I've measured the thickness of the shells with a Micrometer and they are 1.53, 1.52, 1.54, 1.59. 1.61.

[mike the bike]

I've got half a B stamped on mine.  Sounds like a Monty Python song