Numbers Stamped on Top of Block Surface?

 

After cleaning the old head gasket from my 4KC block I found a series of numbers.  Do these numbers correspond to rod bearing or main bearing size as you would find on a 4age?  Are they perhaps ring sizes?

 

Here are some pics to illustrate what I am talking about. I colored each stamp with marker to allow the stamps show up better on camera:

 

 

 

 

From the pics, left to right the top numbers are:

 

2 2 4 3 with the 3 being closest to the front of the engine

 

Bottom left to right:

 

1 22 23 22 2

The eight stampings on top of the block appear to be lifter bore sizes.

 

I started the rest of the block prep and on the bottom I found stampings corresponding to the four stampings on the top: 2 2 4 3.  Also,  in the lower corner there are the stampings 7 7 7 7 7.  I would assume these five numbers are the sizes of the five main bearings.

 

I couldn't find any reference to the block stampings in my Toyota K Series Engine Manual. Hopefully,  you'll have more luck.  I can find references to different sized std. main and rod bearings but no reference to different sized std. rings.

 

 

Probably just been rebuilt at some stage. Common to stamp them in areas with the 7s