qestion for bearing and piston class

[hf hpe]

I can't find in manuals how to read the mark that are on the engine block
this R-R-R-R-R
I know that they are for pistons, main and rod bearing classes but can't find more info
http://i115.photobucket.com/albums/n288/BrulTM/Alfa%20155%20Q4%20repair/parts/blok3.jpg

[Evodelta]

The codes for the items you require are stamped on the base of the block, or even better, just measure them.
The RRRRRR sticker doesn't have anything to do with what you are asking.