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Headers on a 2000 F150 4.6 V8? #4646136
01/25/18 05:14 PM
01/25/18 05:14 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
To all you guys who are familiar with this,which are the best and the easiset to install headers to install on a 2000 F150 4.6 V8?

Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646161
01/25/18 05:48 PM
01/25/18 05:48 PM
Joined: Aug 2017
Posts: 559
MN
14Accent Online content
14Accent  Online Content
Joined: Aug 2017
Posts: 559
MN
None of them. Pretty sure the cab has to at least be raised to get those headers in and out.


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Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646167
01/25/18 05:51 PM
01/25/18 05:51 PM
Joined: Apr 2008
Posts: 37,147
Ontario, Canada
OVERKILL Online content
OVERKILL  Online Content
Joined: Apr 2008
Posts: 37,147
Ontario, Canada
The Gibson stainless ones.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: Headers on a 2000 F150 4.6 V8? [Re: OVERKILL] #4646208
01/25/18 06:49 PM
01/25/18 06:49 PM
Joined: Nov 2006
Posts: 19,921
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,921
MA, Mittelfranken.de
+1 the Gibson Shorty stainless, not need to raise the cab on this one but the manifolds can be a PITA to remove, be prepared for broken studs.
Install them with new Ford stainless studs and nuts or copper aftermarket nuts.


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Re: Headers on a 2000 F150 4.6 V8? [Re: Trav] #4646223
01/25/18 07:09 PM
01/25/18 07:09 PM
Joined: Aug 2012
Posts: 3,041
Cincinnati
donnyj08 Offline
donnyj08  Offline
Joined: Aug 2012
Posts: 3,041
Cincinnati
Originally Posted By: Trav
+1 the Gibson Shorty stainless, not need to raise the cab on this one but the manifolds can be a PITA to remove, be prepared for broken studs.
Install them with new Ford stainless studs and nuts or copper aftermarket nuts.


^ this. Prepare for some bloody knuckles. The last one I did I pulled the engine, did timing chains and guides etc while it was out. It was almost as fast sadly. Im not suggesting you do that by any means...the modulars are just a Pain to replace manifolds on.


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Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646253
01/25/18 07:36 PM
01/25/18 07:36 PM
Joined: Dec 2016
Posts: 6,241
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,241
Waco, TX
NONE.

That engine is "Non-PI" and headers really don't do anything for it.

The PI Intake/heads went on the Romeo 4.6 (NOT Windsor) in 2001


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Headers on a 2000 F150 4.6 V8? [Re: Linctex] #4646283
01/25/18 08:00 PM
01/25/18 08:00 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
So your saying headers won't help at all in regards to performance,gas mileage ect?

Then what are a list of inexpensive things I can do that will be worth spending the money on?

Originally Posted By: Linctex
NONE.

That engine is "Non-PI" and headers really don't do anything for it.

The PI Intake/heads went on the Romeo 4.6 (NOT Windsor) in 2001

Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646285
01/25/18 08:01 PM
01/25/18 08:01 PM
Joined: Dec 2016
Posts: 6,241
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,241
Waco, TX
From this post:

https://www.ford-trucks.com/forums/852198-can-you-upgrade-a-4-6-npi-to-pi.html

The heads,etc from a car are interchangeable with a truck/van, but using the car intake will make the truck/van a gutless pig. Dimensionally, all Modulars are the same. There are small quirky differences between Windsor and Romeo versions of the engines that'll drive you nuts trying to finish up a swap like your speaking of. Bolt sizes,timing cover differences,etc,etc.
The 60rwhp number is bogus.
By swapping the heads,cams,etc all out from that of a E150 or F150 with PI heads will get you 20-25rwhp. You've gotta remember,many of the people discussing the PI swap are talking about doing it on Mustangs that have a MUCH better flowing intake manifold,and they're usually swapping on a set of ported heads with aftermarket camshafts.

'98 NPI truck engines were rated 220hp,and the '01-up PI head truck engines are rated 240hp.
The cylinder heads themselves are honestly equals when it comes to capability of airflow-the camshafts, intake manifold, and the PCM tune are where all of the power gains come from.

There a minimal amount of power to be gained in a truck PI intake - it's still got the same restrictive design for low-end torque production as it's NPI counterpart-just ever so slightly less, and it's port shape is for the more squarish PI intake ports so it'll seal to the cylinder head properly.
As for parts sourcing based on years:
'97-'99 are the same
'00-present are all the same

This is based on the cylinder head type and camshaft specs. There are little differences through the years,but as far as power potential-the above is true.

I've driven both PI head and NPI head trucks- the '01 F150 work truck with PI heads (supercab 4.6L/4R70W 2WD) compared to my old '98 F150 with NPI heads and PI cams (supercab 4.6L/4R70W 2WD),and it was almost impossible to tell the difference between the two.
I would'nt touch the heads-I'd swap the cams and be done. There's not enough power gain benefit to offset the absurd amount of work to pull the heads,etc and the costs involved with head gaskets and head bolts,etc.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646289
01/25/18 08:02 PM
01/25/18 08:02 PM
Joined: Dec 2016
Posts: 6,241
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,241
Waco, TX
Originally Posted By: lawnguy

Then what are a list of inexpensive things I can do that will be worth spending the money on?


I can't think of anything.

Keep your money in your wallet.

You can throw lots of money at the truck, but in the end you'll just be broke.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Headers on a 2000 F150 4.6 V8? [Re: Linctex] #4646313
01/25/18 08:27 PM
01/25/18 08:27 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
Which exact cam would you put in,and replace the factory oem cam? What differences will I notice both positive and negative?


Originally Posted By: Linctex
From this post:

https://www.ford-trucks.com/forums/852198-can-you-upgrade-a-4-6-npi-to-pi.html

The heads,etc from a car are interchangeable with a truck/van, but using the car intake will make the truck/van a gutless pig. Dimensionally, all Modulars are the same. There are small quirky differences between Windsor and Romeo versions of the engines that'll drive you nuts trying to finish up a swap like your speaking of. Bolt sizes,timing cover differences,etc,etc.
The 60rwhp number is bogus.
By swapping the heads,cams,etc all out from that of a E150 or F150 with PI heads will get you 20-25rwhp. You've gotta remember,many of the people discussing the PI swap are talking about doing it on Mustangs that have a MUCH better flowing intake manifold,and they're usually swapping on a set of ported heads with aftermarket camshafts.

'98 NPI truck engines were rated 220hp,and the '01-up PI head truck engines are rated 240hp.
The cylinder heads themselves are honestly equals when it comes to capability of airflow-the camshafts, intake manifold, and the PCM tune are where all of the power gains come from.

There a minimal amount of power to be gained in a truck PI intake - it's still got the same restrictive design for low-end torque production as it's NPI counterpart-just ever so slightly less, and it's port shape is for the more squarish PI intake ports so it'll seal to the cylinder head properly.
As for parts sourcing based on years:
'97-'99 are the same
'00-present are all the same

This is based on the cylinder head type and camshaft specs. There are little differences through the years,but as far as power potential-the above is true.

I've driven both PI head and NPI head trucks- the '01 F150 work truck with PI heads (supercab 4.6L/4R70W 2WD) compared to my old '98 F150 with NPI heads and PI cams (supercab 4.6L/4R70W 2WD),and it was almost impossible to tell the difference between the two.
I would'nt touch the heads-I'd swap the cams and be done. There's not enough power gain benefit to offset the absurd amount of work to pull the heads,etc and the costs involved with head gaskets and head bolts,etc.


Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646330
01/25/18 08:43 PM
01/25/18 08:43 PM
Joined: Aug 2012
Posts: 3,041
Cincinnati
donnyj08 Offline
donnyj08  Offline
Joined: Aug 2012
Posts: 3,041
Cincinnati
If the studs are broken and the manifolds are leaking you can buy replacement Dorman manifolds for like $50 each. Spend $150 on two manifolds and stainless studs. If you have no leaks id leave it alone.


2008 Silverado Z71 LT 90k Maxlife FS 5w30
2010 Ford Escape 172k QSUD 5w20
2016 Yamaha XSR900 12k, Rotella 15w40 Yamaha Filter.
Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646373
01/25/18 09:46 PM
01/25/18 09:46 PM
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
Modern computer-controlled emissions equipped engines *with a catalytic converter* don't benefit from legal CARB-complliant headers.

"Shorty" headers are just manifolds anyway. A header manufacturer can't get a CARB number for a true header for an ODBII engine. AT the same time, the OEMs these days build manifolds that flow quite well, probably capable of handling 10 or more % more flow than the stock motor needs. And they're quiet.

The shorty's look cool, but be sure you understand that's why they're in the market. They may rob torque from your truck motor which is not ideal.

Remember the no 1 rule of exhaust enhancements: they must be made in coordination with compatible intake flow improvements. If you're not touching the rest of the motor, they are almost guaranteed to do nothing (if you're lucky) or cost some power (if you're not).


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646386
01/25/18 10:06 PM
01/25/18 10:06 PM
Joined: Jul 2017
Posts: 309
PR CA, USA
2strokeNorthstar Offline
2strokeNorthstar  Offline
Joined: Jul 2017
Posts: 309
PR CA, USA
No benefit except looks. Potential for more leaks and loose hardware in the future. Harley / Lightning used the same exhaust manifolds as non boosted so that says something. I have had an 01 f-150 5.4l for a long time and toyed with the idea of shorty headers. The Cat. Converters make some odd noises already so I just left it alone. Don't want to make a new problem. Ford of course says it's normal to sound like [censored] and offer some exhaust shield wrap kit for $600.

Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646400
01/25/18 10:21 PM
01/25/18 10:21 PM
Joined: Feb 2003
Posts: 7,427
Jupiter, Florida
Cujet Offline
Cujet  Offline
Joined: Feb 2003
Posts: 7,427
Jupiter, Florida
I did the stainless headers on my 98 4.6L F150 (which now has something like 380,000 miles on it) I also added a Gibson single sweptside exhaust a superchips "chip" , K+N and larger airbox intake tube.

It made very little difference. A couple of things, the headers themselves sound "tinny" as a little noise escapes through the walls of the thin header tubing (not a leak) . I ended up putting tons of insulation on the footwells to quiet down the additional crummy noise. The cast iron manifolds do a good job keeping the engine quiet.

I will tell you that the PI Police interceptor 4.6L is a far more powerful engine, mostly due to it's high revving nature, than my truck engine is.

Also, when the Gibson exhaust finally rusted, I put back on the stock exhaust. It lost some high RPM "umph" for sure.

If I were to guess, I'd say all the mods added 10HP.


People who count on their fingers should maintain a discreet silence.
Re: Headers on a 2000 F150 4.6 V8? [Re: lawnguy] #4646473
01/25/18 11:41 PM
01/25/18 11:41 PM
Joined: Sep 2015
Posts: 5,858
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,858
Kalifornia Kollective
OK, power 101 - it all comes from fuel. To make more power, you have to burn more fuel. When someone says these heads flow better, that is what they do - flow more air. But if you keep the stoichiometric ratio where it needs to be, you will have to increase fuel flow. That is why OEM sell bigger engines when customers want more power. Physically bigger engine, or better flowing system on existing engine and wind it tighter - only two ways t get more power.

And none of this means much below 3,500 RPM where the OEMs have really done their homework. If they could get 5 hp w/o hitting the fuel consumption numbers, they'd be all over it. They'd spend millions to get it fleet wide. HP sells cars. Headers may actually hurt below 3,500 unless temp tape wrapped. Iron manifolds retain the heat to help keep exhaust flow high at low engine speeds ...

So if you are living above 3,500 much - it might help a little ... If you drive mostly below that - not going to help.

An increase in dynamic compression ratio will give you more torque and means more felt power. But if you are already living on the anti-knock sensor pulling timing, you can't do much about adding CR either ...

Last edited by BrocLuno; 01/25/18 11:44 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
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