All of you are going to hate me now, but all of the mod and performance work i've done before buying my truck has always been on imports, i've owned 2 Z31's (one pushing 368rwhp), an 83' supra with a 7MGTE conversion, and a 71' VW karmann Ghia with an all motor 2160cc.
Anyway, my truck is the first real domestic i've done, i've kinda got the basics, but what is all this stuff about the P.I. motors and a N.P.I., i know what they stand for... but what are major differences. Thanks.

 

Two areas are, more threads in the spark plug holes to address a physical blow-out problem and a small improvement in airflow.

 

so it was just ford's fancy way of re-wording "heres an engine thats not going to **** up."? in a general sense.

 

The pi heads also build higher compression. But you dont have to worry about them. They were standard after 01.

 

hes got an 06 is a 3v...

 

Mr. Faster150, this is like my 41st thread, now i know i didnt specify in this one, but i always list as a 4.6... the ONLY 3v 4.6 is in the mustang..... thank you

 

No dude - you have a 3 valve. All 2004 + 4six's & 5fours in the F150 have 3 valve heads. The motors were redesigned for 04 and haven't changed much since.

97 -03 motors are 2 valve.

It helps if you put 4.6L somewhere , like under join date or above your post count , in there somewhere, include it in your signiture works as-well. That way you don't have to specify.

BTW - What's a F159 ?

Well, hope that helps

 

JBREW! i'm sorry about 159, i got a fat slipping finger... but i don't know where you get your info.... http://www.fordvehicles.com/trucks/f150/features/specs/ last time i checked 16 devided by 8 is 2... i know how many valves my engine has, so... once again, the 4.6L in the F150 is TWO VALVES! MUSTANGS ARE 3 thank you for noticing mt slipped finger

 

Yah , I hate when the other buttons get in the way..

 

All 4.6 L Tritons are either 2-valve SOHC or, with the introduction of the 2006 Ford Explorer, 3-valve SOHC designs.

Ford's plant in Romeo, Michigan produces five different 4.6 L modular V8s, of which two are Tritons. The two Triton lines are the cast iron units used in the Ford F-Series, Expedition, and Econoline and the aluminum block versions used in the Ford Explorer and Mercury Mountaineer.

The 2-valve SOHC version in the 2001 and later model years produces 231 hp (173 kW) at 4750 rpm and 293 ft·lbf (397 Nm) of torque at 3450 rpm. The 3-valve SOHC version produces 292 hp (218 kW) at 5750 rpm and 300 ft·lbf (407 Nm) of torque at 3950 rpm. Both use multi-port fuel injection, cam followers, fracture-split forged powder metal connecting rods, and a fiberglass reinforced plastic intake manifold.

 

yeh 2v 4.6 is still in the f150 its got lik 248hp though