Where it screws into.





What's broken.
Top picture was taken next to the distributor, at the back of the engine.
When I was loosening the pipe ( top picture ) that leads to the exhaust, I snapped the bottom picture in half. What is it? I can't put the manifold back on until i replace it. its in a tough spot.

 

That is your Oil Pressure sending unit. Its like $20 and easy to replace while it is apart. If you put the intake back on first which I think you have to you will need a special socket for it. I think that cost me less than $20 too. You will have to get that EGR pipe started before fixing the intake back in place. I suggest that you do that before even trying to start any of the intake bolts.