Alright, my muffler guy told me that you can change the heads and intake manifold on a 4.6 and use the 5.4 stuff to make it a 5.4. he sounded like he knew what he was talking about.

 

yep he knows whats up. that is exactly how you build a 5.4.
















not! how are you going to get .8 liters from a head swap??????????????? the 4.6 and 5.4 are 2 different engines.

 

Those would be some mighty interesting heads.
Quite a combustion chamber I'd guess.

 

In a more direct way: The blocks are not interchangeable, the heads and intake from your 4.6 will work on a 5.4, but you can't make 5.4 from a 4.6 block.

-Kerry

 

yea, he said that, but he said the blocks were the same. i didnt plan on doing this, but i thought it was kinda interesting

 

You could always ask him how he came about this conclusion. The bores for each engine are identical, but the deck height is not, it's not just a crank and rod change like a stroker kit. Even if you swapped in the crank and rods from a 5.4, the engine would never work, the pistons would come up through the heads, but the conn rods might slap the cylinder walls first preventing the crank from moving anyway.

-Kerry

 

I think the stroke is different on the two. The heads should be the same. Unless you have a 97 or 98. They have the non PI heads. You can put the 99 and later PI heads on a 4.6 but need to use the intake also. The PI heads will breath better and also raise the compression on a 97-98 4.6 and 5.4.

 

nope all the modular enignes use the same stroke. the bores are different.

4.6 3.55x3.54 5.4,6.8 3.55x4.17

 

Bores are same, stroke is different. 3.55 bore on both. Why else would the deck height need to change if the stroke was the same?

A 3.55 stroke with a 4.17 bore is 387ci / 6.3L. With a big bore and small stroke it would make one hell of a Mustang motor and a horrible truck engine.

 

Where did you learn this? You can check the specs pages here at the site to prove yourself wrong.

-Kerry

 

that is direct from the ford website..

 

Maybe we should campaign to have that removed... it's wrong.

-Kerry

 

2002 SOHC 4.6-Liter Triton(TM), V8, 16-Valve, SOHC Engine
Compression Ratio 9.30
Horsepower@RPM 231 hp @4750rpm
Torque Lbs. Per Ft 293@ 3500
Cylinder Configuration Vee
Valves per cylinder 2
Bore 3.55
Stroke 3.54

2002 SOHC 5.4-Liter Triton(TM), V8, 16-Valve, SOHC Engine
Compression Ratio 9.00
Horsepower@RPM 260 hp @4500rpm
Torque Lbs. Per Ft 350@ 2500
Cylinder Configuration Vee
Valves per cylinder 2
Bore 3.55
Stroke 4.16

 

ok i made a stupid mistake i copied the 4.2 and 4.6 specs i meant to copy the 4.6 and 5.4. but one thing still seems wrong with fords info, they say the 4.6 has CAST IRON heads but i am pretty sure all modular engines have aluminum.

Engine type 4.2L OHV 12-valve V6 4.6L Triton® SOHC 16-valve V8 5.4L Triton® SOHC 24-valve V8
Engine electronics Electronic ignition system, Electronic ignition system, Electronic ignition system,
EEC-V computer EEC-V computer EEC-V computer
Displacement 256 CID 281 CID 330 CID
(cu. in.)
Horsepower (SAE net@rpm) 202@4,350 231@4,750 300@5,000
Torque (lb.-ft. @rpm) 260@3,750 293@3,500 365@3,750
Compression ratio 9.2:1 9.3:1 9.8:1
Bore x stroke (in.) 3.81x3.74 3.55x3.54 3.55x4.17
Main bearings 4 5 5
Valve lifters Hydraulic roller Hydraulic roller Hydraulic roller
Fuel delivery Sequential electronic fuel injection (SEFI) Sequential electronic fuel injection (SEFI) Sequential electronic fuel injection (SEFI)
Recommended fuel Unleaded regular Unleaded regular Unleaded regular
Exhaust Stainless steel Stainless steel Stainless steel
Transmission type 5-speed manual overdrive (std.); electronic 4-speed automatic overdrive (opt.) Electronic 4-speed automatic overdrive Electronic 4-speed automatic overdrive
Engine block material Cast iron Cast iron Cast iron
Cylinder head material Aluminum Cast Iron Aluminum Alloy

 

lol I was doing the same thing when I was looking up specs. (4.2)


My 97 4.6 has aluminum heads.