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As another solution, instead of needing a plug. I cut off the end of the insert, drilled it out, pressed in a plug so I could make the hole smaller, and used it as the port for my boost sensor. This is the only pic I could find.

Ha! I like hearing that. I don't feel that young, and I was driving by the end of the 80s... And not far from you in fact. I grew up on the east side, in Issaquah. I'll admit to no experience on American cars. However, I do have an american engine in one my vehicles though (chevy 350), and...

I checked all the straight pipe and even the British straight pipe fittings I could find data for. The pitch matches right up with 20 tpi, but the diameter is an odd-ball 25/32" I couldn't find anything near that. It's far finer pitch than typical pipe threads of anything near that diameter...

Actually it's parts 26 and 27. the M18x1.5 fits into the spark plug hole (where part 31 goes). I've been searching for the last hour or so to find anything to go in there without tapping. The ether kit supposedly plugs that (if I remember the contents of this thread correctly), so that might be...

I bought these, but then found that my heater nozzle wasn't M20x1.5 It's M20x1.25 (I checked and rechecked). That seems to be an unobtainium thread size. All I found were taps and dies that size, not even any bolts, let alone plugs. 1.25mm pitch is very close to 20tpi, but the diameter...