V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

4.2 swap

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Old Mar 28, 2007 | 04:32 PM
  #1  
FoRdBoY357's Avatar
FoRdBoY357
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Default 4.2 swap

I have a 2000 V-6 5-speed. I know where I can get a F-150 4.2. I know the 4.2 is just a stroker 3.8. How hard is it to swap the 4.2 into my Mustang? I am thinking it would be pretty simple.
Old Mar 28, 2007 | 08:01 PM
  #2  
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Default RE: 4.2 swap

from what iv heard no problem at all for split ports to swap them in

is it a entire motor orjust the crand or just the lower end no heads or intake

u can use ur stock 3.8 heads and intake manifold and headers
Old Mar 28, 2007 | 08:09 PM
  #3  
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Default RE: 4.2 swap

you can move your upper intake to the 4.2 and then you have to move a bunch of the accesories and random things onto the new engine and it will bolt right in
Old Mar 28, 2007 | 08:43 PM
  #4  
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Default RE: 4.2 swap

This thread will give you everything you need:

https://mustangforums.com/m_2804396/tm.htm
Old Mar 29, 2007 | 01:32 AM
  #5  
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Default RE: 4.2 swap

Well, I'm gonna leave the 4.2 out of the car for a while and stick a cam in. I'm a machinist so I can CNC port the heads. It'd be a pretty sick little 6-cylinder.

What I'm saying is (If nobody followed) i'm gonna leave the 3.8 in the car until the 4.2 is built the way i want it.
Old Mar 29, 2007 | 01:37 AM
  #6  
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Default RE: 4.2 swap

ive been wanting to do the same thing...just cant find a 4.2
Old Mar 29, 2007 | 01:54 AM
  #7  
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Default RE: 4.2 swap

I've found a 4.2 out of a 2003 F-150 for $1200 with 60K miles on it. I'd love to have the engine, but that's a bit pricey.
Old Mar 29, 2007 | 12:20 PM
  #8  
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Default RE: 4.2 swap

Look for wrecked F150's. The 1997 actually had the most powerful 4.2L in it. I bought mine out of one that was hit in the bed. It happened to be a built bottom end for what was to be a turbo application on a Lightning look-a-like V6 truck. Got mine fairly cheap. Check junkyards and truck forums. They are out there cheap.
Old Mar 29, 2007 | 05:45 PM
  #9  
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Default RE: 4.2 swap

ORIGINAL: FoRdBoY357

I've found a 4.2 out of a 2003 F-150 for $1200 with 60K miles on it. I'd love to have the engine, but that's a bit pricey.
damn that engine should only be about $600 tops
Old Mar 29, 2007 | 05:46 PM
  #10  
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Default RE: 4.2 swap

All, i want is the engine. Thats all. Ive got no use for the rest of the truck. I guess if i got the whole thing, i could pull the engine and try to make my money back



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