97 and 2001 Explorer Engines

Im looking to do an EFI 5.0 swap sometime in the future and I might of found 2 candidates. They are both 5.0s out of Explorers, one is a 1997, the other 2001. I am planning on taking the whole engine out, rebuilding it, and maybe a new cam. I will keep the heads that are on it, assuming they are GT40 non P. Which one will have the GT40 heads?

I tried to look for the "4 lines" but I couldn't see them. Are they on the back side of the head?

 

the 97 should be GT40s, but I think they went to P mid year.

Look for 3 lines, not 4. 4 is P head.

 

Did it go mod motor by 2001?

 

Im not sure but the 2001 explorer I saw was not Modular.

 

Mod motor didn't start until the third generation Exploder, in 2002.

 

So what is the difference between the GT40 P and non P heads?

 

spark plug angle so you cant find a header that fits are cars

brad

 

I was trying to convince myself to pull the trigger on a set on ebay but just couldn't do it. Now I come here, see your post and I'm glad I didn't! I take it for our cars we are better of with the non P heads.

 

http://mmb.maverick.to/showthread.php?t=18214&highlight=gt40p+header

Check this out, it shows P heads with headers mocked up.

 

The "P" heads also have a "P" cast into the front corner of the head, next to the valve cover. The non "P" heads have a GT cast here if I'm not mistaken.

 

I sure am glad I didn't pull the trigger, I think I'll just go with aluminum heads instead. I'm still a long way away from needing heads any way.