Spark plug reach

yellow rose said
AFAIK, you have no choice but a 13/16 hex. And that sucks.

I have never seen that “J” series plug with anything other than a 13/16 hex.

I have the same problem with my Hedman 78030. #6 plug is hard to reach in the first place, and the tube interferes with a 13/16" socket. But I'll be fixing it soon... by putting on aluminum heads that use a 5/8" plug :D