PI valves in NPI head

[98COBRA281]

i know pi valves are a little bigger then npi valves, but can you put stock pi valves in a npi head with new valve seats? i can do valve seats at my school for pretty cheap, and maybe i could pick up some stock pi valves for a good price.

 

[CobraRed_96_GT]

negative (at least to my knowledge) - you need valves designed for that head, oversized FTW. And unless you go to Wyotech or UTI make sure to be careful on those seat grinds, i know i messed up 50% of all the ones i did in school Luckily they were just practice heads anyway

 

[Greenbird]

Only the exhaust valve is bigger, and you wouldn't want it anyway, it is too big. Even the high dollar SVO heads use a smaller exhaust valve than the PI head. Your also better off having your porter do the valves and seats. Those can be worth just as much as the porting itself.