They're the right plugs guys - how can you fuck up getting a spark plug right? They're a standard NGK plug; the TR6's. They're a 5/8" spark plug. They screw and seat into the head perfectly fine - BY HAND. The problem is not the plugs fitting into the head, nor the plugs being "wrong" - it is in the casting of the head, the design of the head. When the head was made and the metal was cut into to make the hole/seat for the plug - they did not remove enough metal to allow for a spark plug AND SOCKET to fit down into the bowl. Therefore you can only get them hand tight, due to not being able to get the spark plug socket into the head.

Pat - when I talked to you yesterday I told you this. You said to shave the socket down to fit into the head. Now today you're saying it's the wrong plug, and hard to believe?

These heads have been nothing but problems unfortunately. From the valve train, to the fitment of the intake, to the fitment of the headers, to the fitment of the valve covers and now to the fitment of the spark plugs. The heads are going to be sold, and replaced with something worthy of my time and money...