Cylinder Heads 101

66dartgt,
Remove as much of the pushrod pinch as you can and make it as straight as you can this will help greatly with the flow.
You can safely remove the boss from the valve cover retaining bolt and use a sealer when installing the bolt back in the head.
What I would do is use a straight edge and a sharp marking pen, make a mark at the top and bottom of the pushrod hole on the intake face, use this as a guide to keep the wall of the port as straight as you can. You will want to leave about .030 of material to be safe. This can be measured from the straight edge to where your grinding with a thin piece of material thats .030 thick or a feeler gauge. Usually the factory port opening is close to the point where you would have to stop grinding, if this hasn't been opened up yet. You can usually go straight in from the original opening and be safe, then match the port to the gasket, this is just another way of doing it.


BJR Racing