PI heads

Reply Subscribe

Thread Tools

Search this Thread

Jul 26, 2007 | 12:21 PM

BURNSTOUGHFORD

Thread Starter

Posting Guru

Joined: May 2006

Posts: 2,486

Likes: 0

From: Iowa

PI heads

How come not all the heads produced after 99' dont have PI on them.. I thought that both the 4.6l and 5.4l had PI heads after 99' .... I have seen several trucks latley in the bone yard that dont have PI cast into them and I know for a fact that they are 2000 or newer...

My 02' 5.4l that i swaped did have PI on it though... just somthing i noticed..

Jul 26, 2007 | 12:39 PM

galaxie641

Postmaster

Joined: Nov 2006

Posts: 4,517

Likes: 3

From: SE Wyoming

5.4L went to PI in '99, 4.6L's on the other hand did not at the beginning of the year from everything I have seen and read, some people even claim to have '00 4.6L's that are NPI. Now in Crown Vic's 4.6L's didn't go to PI heads until '01, Stangs switched in '99. Trucks seem to be varying on when exactly the 4.6L's switched over. I have never heard or seen a definite build date on the 4.6L's in trucks.

Jul 26, 2007 | 01:11 PM

BURNSTOUGHFORD

Thread Starter

Posting Guru

Joined: May 2006

Posts: 2,486

Likes: 0

From: Iowa

Well im saying f-150 4.6l's after 2000 with non PI stamped heads...im wondering if they just didnt get stamped sometimes...maybe its a romeo/windsor thing...i dunno

Jul 26, 2007 | 10:24 PM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

Could have been some leftover heads or maybe some one thought that there 4.6L was too powerful and put non-PI heads on to drop the power down to about 150hp with 7.5 to 1 compression

Last edited by LxMan1; Jul 26, 2007 at 10:28 PM.

Jul 27, 2007 | 06:22 AM

BURNSTOUGHFORD

Thread Starter

Posting Guru

Joined: May 2006

Posts: 2,486

Likes: 0

From: Iowa

Quote:

Originally Posted by LxMan1

Could have been some leftover heads or maybe some one thought that there 4.6L was too powerful and put non-PI heads on to drop the power down to about 150hp with 7.5 to 1 compression

I dunno about that... but anyways... not a big deal... just somthing i noticed when i was rummaging threw the 99-03 f-150 bone yard my cousin has.

Jul 27, 2007 | 07:39 AM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

I haven't really seen too many in the bone yards to tell. Seems most that I saw at one yard were all V6 XL trucks. I would think any of them 2001-up would be PI, but ya never know.

Jul 27, 2007 | 08:06 AM

BURNSTOUGHFORD

Thread Starter

Posting Guru

Joined: May 2006

Posts: 2,486

Likes: 0

From: Iowa

Quote:

Originally Posted by LxMan1

I would think any of them 2001-up would be PI, but ya never know.

Thats what i was thinking... but i dunno... the bone yard is my cousins parts trucks for his builders...i think he has completed 80+ trucks of our style and resold them...hes got 7-8 whats left of full trucks laying around... and thousands of parts in boxes and barns....really convienent... thats where i get all my upgrades at including my motor.. im going to convert my interior to grey next summer i think.. from the tan...