Numbers Stamped On Top And Bottom Of Block Surface?

[redvalkyrie]

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

[redvalkyrie]

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.

 

 

[springersrolla]

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