lol the 2nd one boss, thank you for pointing this out. I feel as i spend more time here this intro message is some thing i will always make me laugh and shake my head at.
Perfect Intro:
I have the vehicle
Possibly avoid using a Cometic one unless the deck/head surface are perfectly flat.
I did have a look just then and forgiving gaskets such as Tomei or Nitto don't exist for the FJ20, however the Bar-Tek or Kameari ones look good and might do the trick.
Because pipe threads for pipe things. M threads for bolt things.
Throw some teflon sealant onto it and dust your hands off knowing you did the right thing, instead of going twice around the block to achieve a result using the wrong things.
Of course, all of these solutions are ignoring the fact that the minimum thread pitch we're talking about here is 1.25mm, with the 1/4" in NPT or BPS being out around 1.4mm. You will need to know that the boss you're tapping has enough thickness for at least a few threads. That's one of the reasons that 1/8" is commonly used - because the pitch is <1mm.
And why would you look to use 1/4" NPT in a BSP country anyway? Ugh.
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