The oil pressure sender in my ‘87 Suburban V20 started leaking. I ordered a replacement from Oreilly’s, but it ended up having a different diameter where it threads in. My engine has a fitting between the sender and the block. I think it was probably put there to help the sender clear the O2 sensor.
Anyway, the hole in the block itself is 1/2” too. Oreilly’s says they don’t have that and only have 1/4” or 1/8”.
Do I have some weird size, or is that common? I have a remanufactured 5.7. However, I had transplanted the sender and the fitting from the last engine so that was the same 1/2” as well.