I saw this when I dropped the pan on my spare block to examine the crank etc. It looks like it is stamped into the block

 

Never seen that. Looks like someone engraved it on there. It's not stamped.
(unless you're talking about the P72).

 

Nope, I am talking about the lettering that looks like engraving. Is the the codes for the bearings for the crank?

 

it doesn't look like bearing codes, and i've never see that type of thing engraved on the block before.

You must have a magical block

 

I have seen that in all my blocks (b18c1 and b16a).
dont know what it is.

 

The engraved letters you see are the block's main journal codes for sizing main bearings with respect to crank journal sizing.

-kenji

 

The letters on the block correspond to the size of main journal caps.

The numbers on the crank refer to the size of the main journals on the crank.

You pair up these two and look up the bearing size on the chart.

Since you have all B's and C's, you have main cap sizes in the middle of the range that goes from A to D.

Just keep in mind that these codes are usually not applicable b/c of the wear & tear on the journals...so you have to either mic the crank journals (OD) & caps (ID) and do a little addition and subtraction, or you can plastigage them to make sure you use the correct bearing sizes to get the proper oil clearance.

 

So you are saying, that if that crank is used in that block, those are the bearing sizes that have to be used for the crank main journals. Are all cranks the same?

 

you use that code.. and the code you will get from your crank to determine what color bearings you will need.

 

Where?? I can't see - please make the picture bigger.

 

If you really want me to, I could <said in my most sarcastic voice>, really, I could. That is not the max resolution on my camera

 

...mmmmmm

 

OMG.. the Type R was created by an alien civilization.