Sorry, I mean the big one in the middle of the photo that connects to the head just below the vacuum nipple. The one with the braided wrap. Its part number is listed on it, and the thread title, but I still can't figure out where it goes.
Part of the coolant system that feeds into the metal coolant tube that runs along the glow plug side of the block. On my swap I deleted that tube in favor of a hose but have a brass tee that this hose ties into.
I had plenty of room to retain the oil cooler but deleted my expansion tank in favor of a radiator with overflow (87 Toyota 4 runner).
I honestly don't remember the return/feed directions as that part of my build was done sometimes between 2020-2021. If I remember correctly it feeds into the same section of tubing that the coolant reservoir ties into.
It wraps around the back side of the cylinder head, underneath the tandem pump, and connects back into the metal coolant pipe on the left side of the motor. Like this!
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