I have a few questions about the plugs for oil drains,
First Why put them in? afaik the head has no holes there wont that stop anything from coming up? Or will the oil vapors ruin the HG like on the T3 heads when the small oil plug leaks on the back of the head?
Second, does it matter what type of metal the plugs are made of??
again referring to the T3s where the head plugs caused cracking due to different expansion rates?
Third will something like this work?
if so i could counter-sink the plugs and do 2 things first not pay to have them machined flat and Second they would be removable if i wanted to go back to a stock head