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Discussion Starter · #1 ·
Ok ...my buddy's 99 F-250 5.4 and he has water in his oil and over heating so I'm sure the heads are shot...and well I want to buy some aftermarket heads and he has no money so I was wandering if my 4.6 mustang gt heads and maybe even cams will work on his 5.4?
 

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everything is pretty much the same on the 5.4 as the 4.6 except the deck height. the heads are identical provided they are both PI heads or non PI heads.
 

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Discussion Starter · #6 ·
Lol... K he'll be happy to hear it'll work... So will he gain or lose power? Or will it stay the same?
 

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if they are PI heads going on the a car that had the same PI heads, then no he wont. if they are non PI head going on to a car that had PI heads he will lose power. If they are PI heads going onto a car that had non PI heads then he will gain power. and finally, if they are non PI heads going onto a car that started as having non PI heads that he will stay the same.

cams are all the same.

^CONFUSING
 

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Discussion Starter · #8 ·
So the 240 horse 4.6 truck motor has the same exact heads and cam's as the 260 horse gt? Weird
 

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the truck has a longer stroke and a different intake and makes more torque.
 

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Discussion Starter · #10 ·
Really? Longer stroke? I knew the intakes were different but I didn't think 20 hp diff...
 

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well the f150 makes its power down low because of the long runner intake. it makes about 300 ft/lbs outta the box
 

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Really? Longer stroke? I knew the intakes were different but I didn't think 20 hp diff...
<--- Blows Conch

Longer Stroke... Hence the added deck height...

Rods - Longer ,Crank - Longer throw

4.6L Rod length = 5.93"
5.4L Rod length = 6.65"

Pistons are interchangeable between the DOHC and SOHC, 6.8L, 5.4L & 4.6L engines.

But you will need to check piston to valve clearance when doing so.
 

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the truck specs-Base Number of Cylinders: 8 Base Engine Size: 5.4 liters
Base Engine Type: V8 Horsepower: 235 hp
Max Horsepower: 4250 rpm Torque: 335 ft-lbs.
Max Torque: 3000 rpm
the stang specs-Base Number of Cylinders: 8 Base Engine Size: 4.6 liters
Base Engine Type: V8 Horsepower: 260 hp
Max Horsepower: 5250 rpm Torque: 302 ft-lbs.
Max Torque: 4000 rpm
 

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the truck specs-Base Number of Cylinders: 8 Base Engine Size: 5.4 liters
Base Engine Type: V8 Horsepower: 235 hp
Max Horsepower: 4250 rpm Torque: 335 ft-lbs.
Max Torque: 3000 rpm
the stang specs-Base Number of Cylinders: 8 Base Engine Size: 4.6 liters
Base Engine Type: V8 Horsepower: 260 hp
Max Horsepower: 5250 rpm Torque: 302 ft-lbs.
Max Torque: 4000 rpm
Nice Numbers but you are comparing a NPI 5.4 to a PI 4.6.

To be Fair...

PI Vs PI (99-04)

4.6 260/300 Mustang

5.4 260/350 Truck



NPI Vs NPI (96-98)

4.6 (96-97- 215/290) (98- 225/290) Mustang

5.4 235/335 Truck
 

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Discussion Starter · #18 ·
Oh yall meant the 5.4 has a longer stroke... I was meaning 4.6 to 4.6...truck to gt
 

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Oh yall meant the 5.4 has a longer stroke... I was meaning 4.6 to 4.6...truck to gt
a 4.6 has the same length stroke as a ........ ....... 4.6

^was that necessary?
 

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Discussion Starter · #20 ·
Yes it was... Cause someone said it had a longer stroke and I was wandering how and found out they meant a 5.4...
 
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