they go in the end of the main oil line on the cams.... so that oil pressure builds in the cams to lubricate the journals.
oil is pumped into one side of the cams (the gearbox side) and are stopped at the belt side by the plugs - pressure in the main line rises and oil is pushed out of tiny (and i mean TINY) holes on the journals, which lubricate the cams as they rotate...oils is then returned via one of the oil return lines in the head (you can see them when you get your cam cover off).
without the plugs, the cams wouldn't lubricate properly, you'd probably fill the whole cam cover with oil and make a big mess, as well as break things.
Joka has pm'd me regarding the plugs - it would seem that my previous 2 attempts to ship them to him have failed (i have NO IDEA why.... they are just brass plugs ffs!) - and i'm trying to get them for him. I thought they were for his build, which is slowly progressing, but it would seem the urgency is more about the fact that he's sold his cams...
I'll ship any new plugs i get to him directly as originally agreed and he can onforward them to you.
time frame....no idea...still trying to ring the cam guy (who is probably ignoring me given that its christmas eve.)
I didnt sell my cams, I am still using them for my build if i can ever get some caps

Rob