Hoopster

I just replaced these on my 24v Head, they are NOT stainless (as the picture indicates) mine is on the bench so a bit easier. I screwed a small self tapping screw and levered them out with channel locks. In the truck will be tight but I did see a you tube video where a guy did it. Youtube guy claimed 1/8" NPT pipe plug worked but it is too small after tapping there is almost no thread and certainly will leak. I used a Metric tap M12-1.5 and Dorman 090-108 Pipe Plugs (Autozone online box of 5 was $5) they are yellow zinc coated. There is six of these little plugs all down the passenger side of the head likely have to pull the exhaust manifold to get to the rest of them but that back one is sort of exposed, problem is firewall to head clearance. The old one should come out easy enough but I don't think there is any way to get a new expansion/welsh plug driven in based on the lack of room, tap and threaded plug is the only way IMHO. Good luck.