I believe like badluck they are pressed in. Just leave them be and ask the powder coater to protect those tubes...

Just like they have to protect the gasket surfaces.
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8 3rd gens listed in the build thread (2 are parts mobiles)
Previous Rigs: 90, 91 Camry 82,83, 87 Hilux Pickup
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html