I have a 91 LS motor (B18A1) and i pulled the head off to see what exactly the motor had in it. Well i noticed that on the clutch side there are some numbers in black on the block. I was wondering if this is a factory number printed on here or if it was a sleeve company who put it on the block.


Also what are the thickness of a stock sleeve in a B18A1 bored to 81.25mm.

What is the thickness of an aftermarket sleeve?

 

heres a picture for reference. ( i found it on the internet) Look on the left ignore the writing

 

those are on every block

 

Ok. thanks. i have looked at all my past blocks and multiple of my friends blocks and none of them have had them on there. Just wondering. Thanks again!


Any info on the sleeve thickness?