Engine oil cooler feed line insert.

[ajmac]

That fitting is only waisted as on the V8 it came from there was no cooler return drilled into the block so the horizontal port was used to return the cooled oil into the gallery. All you are doing is preventing the oil going into the main gallery, the long fitting simply does the same job as the grub screw, the one that I'll make will not be waisted as the block already has the cooler return drilled into the main gallery (first post photo). In a UC the horizontal port to the outside world is plugged by design.

Those were the photos I was looking for! Thanks for the second link Jordan.