The Pro-Port casting is a peanut or cnc casting made with more material in the ports and chamber. With this chamber you only have to mill .060 to get 66cc's.As I said pictures and info after PRI show.
Thanks
Jeff Colvert
Jeff Colvert Racing CNC Cyl.Heads
69 Mustang SS/G first in the 9's
68 GT500KR 2330
