StangStang

Ok which one is aluminum? also is it true the that p heads dont have the holes for the air injection system?? What are the valve sizes.
I am suppercharging my 92 5.0, need to decide if these heads will be worth it or not, thanks!

1fastzook

the p heads are steel and they dont have the holes for the air injection but can be drilled

gspfunk

both heads are iron. the P heads flow better....in fact, they flow almost as much as the X heads (aluminum).

GT40 vs P heads

philthy89fifty

do the p heads bolt up i hearn you have to dill for the smog tube.

88BlueGT

Doesnt sound worth it to me... I would just go with a set of AFR's if you have the cash.

gspfunk

The P's flow really well for what they are...stock Exploder heads.

..and since you can usually get them in great shape for under $300, I'd say go for it. You will need a valve spring kit for them to be on the safe side...especially if you're dropping a cam in it.

91stang

and don't the p heads need diferent headers?

gspfunk

Yeah, but they aren't hard to find like they used to be. Most long tubes will work on them and so will BBK unequal shorty'sor FRPP shorty's.

95_302_StangMan

what valve springs will work for the p's?

gspfunk

I got the crane kit from summitracing.com for $130 for my E7's (I know, but I'm a broke ***...), but I'm pretty sure they'll work on the GT40's and P heads as well.