Anyone know what size plug this is? It is located on the side of the block close to the timing chain cover. I believe its an oil gallery plug. I remember a thread about it a few months ago but search wont work for me. A size and/or gm part number would help me out a lot. Thanks in advance.

 

I think this is it, hope this helps. Look at piece 170 in the diagram.

 

Thats it! Thank you Where did you get that drawing?