What goes in this hole? Rear of engine topside...

[klaird]

Got engine back from builder and due to lack of parts labeling, I have no idea what goes here....Buick v63.8. Threaded hole don't know what goes in it. (this is not my engine, I just used the picture as a reference to my question.)

 

[t01blaze]

Oil pressure sensor?

 

[klaird]

Oil Pressure sensor is on the front of the block. I had that labeled properly 🙂. Any other ideas as to what else it can be? Is it vacuum?

 

[Longroof79]

Water temp perhaps? It looks like the threaded hole is right over a water passage and freeze plug.

 

[tc1959]

That Is drilled and threaded for a knock sensor if you want to run one. http://www.gnttype.org/techarea/picture ... turbo.html