Conrod bearing differences

[Grid]

Anybody know what the difference between these is? STD 1? STD 2? 3?

 

[AKKO]

Think @6A13TT TYPE S posted about this some place previously...

 

[6A13TT TYPE S]

graded bearings. lots of manufactures do this. each different part number gives you different clearances.
its been posted about alot here. and how to select the right ones is written in the engine manual.
I always order the thickest bearings and hone the mains and big ends to acheive the correct clearances, thats the best way to do it

 

[Grid]

Ahh makes sense. Thanks.