i posted this earlyer and no one responded so here i go again

i was taking apart my d15 engine and on the end of the engine where the tranny bolts up to the engine there are letters inscribed BAABA it dosnt looked like it was stamped it looks more like someone scratched it in. does any one know what that means or has anyone else found something like this when they were taking a d15 apart or maybe even a different engine
thanks

 

Ive seen that on every D series ive stripped (obd1 and obd2) And have no clue.

 

youve seen that scribed into it was it BAABA or was it something else if you remember

 

Those are the mains Numbers. You match those to the crank for a color coded bearing. Need a helms or haynes manual to decifer them. 5 letters 5 mains.

 

that makes sense thanks man