| Is this a Ducar head? The opening to that port looks huge. How wide is it? Does it match the intake manifold?
Well I normally would grind down the valve guide flush but that means breaking through and dealing with that. If you don't want this extra difficulty you could grind it down and leave it 3mm or so proud of the port roof. If you don't want to break through I would not grind any more from the surface leading up to the guide. If you look carefully at the previous pics you will see as regards shape that the standard port is a tall oval. After porting these ports end up a flattened oval or D shape. This will give you a clue as to shape. The ridge your talking about I'm not sure what area you mean.
Also if you are getting the valve seats redone, cool. If your not, then be damn carefull with the tool around those seats. If you nick 'em theyre stuffed. |