Oil-galleries- how to clean

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Hi,

Just wanted some tips on doing this: pulling the plugs, ream, tap and screw in new ones.

All the ones that I`ve seen sold is NPT, so the hole should ideally be bored and reamed (tapered), but many apperantly just tap it.

I was wondering if I should use metric/BSP plugs instead without taper since I dont have a reamer.

Do all the plugs have to be pulled, or do some actually dont give meaning to pull.
Also: how do you people do this on your rebuild/new block.