RD28 Welch Plugs

[dom14]

Awesome advice. Will do the rest of the plugs. Do I need to remove exhaust manifold to get at welch plugs?

Well.... it's easier with the exhaust manifold out, otherwise it's a tight fit. I did all the exhaust side ones without taking the exhaust out(RB30), but it would've been much easier and less headaches if I did remove the manifold(I had my own specific reasons for not removing the exhaust manifold which won't apply to you in your case). The inlet manifold(in RB30), must come out to have any access to the welch plugs on that side. I'm guessing it should be the same in your case as well.
If you're going ahead and doing all the 30mm plugs, you may find it's cheaper to buy the whole kit covering all the welch plugs on the block(even though you may not do all of them). Ebay sell the kit for $50 or something. Get a similar good deal from a spare part shop, since it appears you can't wait few days to have it delivered.

Use 30mm & 27mm sockets to gently tap the plugs into the plug hole. Sockets help to tap them in straight.