PI Cylinder Heads

[FordRacing1]

I got bad news from the repair shop today. Apparently I either have a blown head gasket or cracked cylinder head. Needless to say, gonna gave to get that replaced. I was looking at some cylinder heads on ebay and some of them say improved spark plug thread holes. They are PI heads. Do all PI heads have better threading or is that something they might have done themselves?

 

[97with24"]

PI heads

I don't know if you got your into yet, but the PI heads all have the extra threads, and a little more power too!!