How can you tell the differance between a non PI head and a PI head. Besides the year of course. I mean 2 sets of heads sitting right next to each other one set is a PI set the other is the old 2v heads. How can you tell, casting numbers, valve size, etc.

 

I may be wrong but I think the P.I. heads will have PI stamped on them. I was told once but I don't remember 100%

 

yea, they are stamped

 

+1 they are stamped.

 

Thank you guys thats what I thought.