9 98svtconvert New Member May 26, 2004 85 0 0 va beach, va Aug 20, 2004 #1 Aug 20, 2004 #1 just curious. what is pi and non pi. i have seen this used in reference towards heads. thanks.
S ShadyRascal New Member Aug 2, 2004 24 0 0 Aug 20, 2004 #2 Aug 20, 2004 #2 I believe that stands for "Performance Improved", referring to the changes they made to the 2valve heads beginning in 1999.
I believe that stands for "Performance Improved", referring to the changes they made to the 2valve heads beginning in 1999.
