Thermostat housing pin hole

That isn't worth JB weld. That is corroded AF.

At the back end of the motor, there is a single 10mm bolt that holds that pipe to the block, near a flange that goes to a section of pipe that feeds the heater core.
If you can access and remove that, you won't have to remove the plenums.

If you can't get one from a local parts yard, I'd try to source one from one of the facebook z31 groups. They are way more active than the forum.

I love jb weld. If you need the Z drive able, I would clean it up as best as possible and give it a try. The hole is really low, so if you do try, make sure your clamp is down far enough. I bet the clamp was directly over it on the old hose.

I agree it's corroded AF and would get a replacement ASAP.

Thanks guys. I'm afraid with all the corrosion removing it may make me go farther down the rabit hole thank I want. Honestly when I was prying with a screw driver I think I'm the one who put the hole it. When I repaired my pontoon boat I used jb weld and special two part epoxy on it and it has held well. Granted it won't see the heat cycles this ever will.

zkarma, do the the two bolts that bolt the housing to the block, do they require removal of the cam shaft backing plate? I'm confident I can get at them, just not sure how far they go into the block.

Wow I went and looked at my spare motor in the garage, I think it may be easier to remove the plenum. That sucker is in there.

When do you need the thermostat housing by? I have a spare one on my junk Turbo engine. It isn't pretty, and could use a real thorough cleaning, but it is miles better than your's.

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It's free if you want it. It was just going to sit in a junkyard for 20+ years when I turn in the junk Turbo engine as a core. I'd rather pass it on in the Z community and it get put to use.

Wow thanks. Pm me a shipping price.