We always bleed at the head. The head will trap air in there that just seems to never bleed itself. The tiniest bit of air in there will overheat you in a hurry.

 

Alright thanks. That bolt is REALLY tight, probably some corrosion on the threads. I really don't want to break it off.

 

I bought the Harbor Freight coolant fill tool. Works just fine. I also put mine up on two cement blocks (per side) first. I'm told either remove the need for dealing with the difficult to get to bleed valve.

I'm certain together they worked for me.

 

I've also found elevating the front while filling helps like stated above. Also agree that bleeding at the head is a P.I.T.A. but is most affective. Be happy it's not a turbo, the heat shields make it much worse.