Oil cooler fitting?

[Guest]

Ok guys, here's the story. This is the oil pressure switch plate that was on my 79 when I bought it. I've seen a few threads about building these, and to be honest, I most likely will eliminate this "upgrade".
my question, is why is the return hole so small? The port for the oil to flow to the cooler looks to be 3/8" or 10mm roughly, but the return hole is less than half of that size. I'm sure the answer is obvious to some, maybe most, but it is eluding me. Any thoughts would be appreciated.

[Danb4563]

image.jpgI guess I should show a pic that shows the return port huh?

[Nessism]

The answer is because that is a poorly constructed adapter. The inlet/outlet port sizes should match. Do you have the piece that fits down into the oil feed port in the engine?

[Danb4563]

Yes, I have tge other piece as well. I had a feeling tge ports should be equal sizes.