GT40P heads and 1.7 rockers ?

[Unit 5302]

Stock GT-40P heads actually lose flow after .500 lift... why you want to increase the lift of your valves by adding 1.7:1 rockers is beyond me.

Also, I hope you have upgraded valvesprings in them, the stock GT-40P springs are only rated for .500 lift which means if you didn't opt for better valvesprings, you'll probably have binding with that cam/rocker combo.

[Ninety5five0]

Yea the springs are upgraded, they are good up to .600 lift. So i should stick with a 1.6 rocker ? Stock size right ? 1.7 gonna give me too much lift for those P's ?

Heres what the specs say for the heads :

ford gt40p cylinder heads with all new parts. features 1.940/1.540 stainless high flow valves 60cc chamber hi performance spings ( .600 lift ) pc seals, hardened locks/retainers and seats 5 angle valve job CBN finished deck. Pedestal rockers required. Heads are fully assembled and ready for install


Will these flow bettter or just the same as stock gt40p heads ?