gt40 vs gt40p

[TMASTER]

I think the GT40 Iron heads are better for me. There flow data is almost exactly the same as the GT40P's
look:
http://www.jason.fletcher.net/tech/f...a/castiron.htm
My set i have burns the fuel perfect!... gold strap with slighty blue half way.... the dyno A/F was right on 12:1

1. GT40 heads can use normal headers, the P's have to have special headers...$$$
2. GT40 heads work with the factory smog lines, and the P's do not accept factory emissions.
3. GT40 heads have larger Exhaust valves from factory.

just my opinion And i got a pair for $425, that had $600 worth of work done to them brand spanking right outta the machine shop.