gt40 or gt40 P - Which are better if want to keep smog?

[Triple White 91]

Just wondering which are better (gt40 iron or gt40P iron) in the area of keeping the engine smog legal, or are they both smog ilegal? I'm learning as I go so I hope this is not a stupid question. I have read that the P's flow better than the origional cobra gt40's, can be found on 97 to 01 explorer's and require special headers.
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[88mouse]

Both are smog heads. I would go with the p's.

 

[JBeezy53]

Both are smog heads. I would go with the p's.

That is true however if you are in California the GT40P will not pass the visual because they do not have the holes for the EGR tubes in the rear of the heads. You could have them drilled for them or rig something up so they look like they are there.

 

[88mouse]

just bolt the tube to the back. We have the same inspection here to. Iam an inspector if they know to look for that iam sure that they can tell that they are another set of factory heads

 

[Triple White 91]

Both are smog heads. I would go with the p's.

I'm a little confused. Do you mean they will hook up to the smog/egr stuff or they will not. Sorry if this is a dumb question.

 

[Mustang78]

i know GT40's are smog legal, the P's are too they just dont hook up the same way your mustang does

~Mark~

 

[RYC CUKR]

You can bolt all your smog equipment up to the Ps. The only difference in the Ps and the regular 40s is that the Ps do not have the thermactor port drilled out on the back of the heads. That said the crossover tube will bolt up just like normal and look fine but it will not be functional.

 

[JBeezy53]

just bolt the tube to the back. We have the same inspection here to. Iam an inspector if they know to look for that iam sure that they can tell that they are another set of factory heads

Thats good to know, maybe I'll get some for my commuter.

 

[68keyblr]

I know this is an old thread, but can someone tell me if the GT-40 heads have the smog tube holes drilled?