more horses for my stock fox

Reply Subscribe

Thread Tools

Search this Thread

10-28-2006, 11:04 PM

#11

Nadelle

3rd Gear Member

Join Date: Mar 2006

Location:

Posts: 551

RE: more horses for my stock fox

^ after 97.5

one little tid bit nobody mentions is that gt40p heads will improve your emissions (if your gonna stay legal) you just must have the holes drilled for the egr if your gonna use the stock mustang setup, about 100$ at a shop

10-30-2006, 04:36 PM

#12

gspfunk

5th Gear Member

Join Date: Nov 2004

Location: Texas

Posts: 3,834

RE: more horses for my stock fox

Quote:

ORIGINAL: jaznasy69

they are deffinately gt40 ..what would be the difference 40 and 40p..? is there a HP difference from the iron and aluminums or is it just the weight

If you can do a little port work yourself, the GT40's are the better head and have larger exh valves. Grind down the thermactor bumps and they will flow better than the P's.

Out of the box, no modifications, the P's will outflow the GT40's up to .500 lift.