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Interested in swapping your 4.6 to a 5.4? This thread lists several problems you may run in to. The most common are:

          Read the full discussion below to find out how to deal with the common issues.
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          4.6 to 5.4 Swap Notes

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          Old Mar 7, 2010 | 11:51 PM
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            #61  
          DBRYCHRIS's Avatar
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          Just double checking I have a 98 f150 4.6 and a 01 5.4 without the wire harness, i can use the 4.6 harness just need to modify a few plugs. Thanks
           
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          Old Mar 14, 2010 | 10:39 AM
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          From: Central PA
          Originally Posted by F-150truckman
          OK Thanks I'm still looking for a motor with the harness and all
          Found a 2007-2008 5.4 3v Flex fuel motor with harness. So from what I under stand is all I would need to do is put this in and have my tune done? Also can also get the ECM for this motor.
           
          Last edited by F-150truckman; Mar 14, 2010 at 12:45 PM.
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          Old Mar 14, 2010 | 01:39 PM
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            #63  
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          That is much more complicated to do. Sorry but these notes only cover the 2 Valve 5.4 swap.

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          Old Mar 14, 2010 | 03:41 PM
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            #64  
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          From: Central PA
          Originally Posted by F-150truckman
          Found a 2007-2008 5.4 3v Flex fuel motor with harness. So from what I under stand is all I would need to do is put this in and have my tune done? Also can also get the ECM for this motor.
          Anyone have any type of help on this one?
           
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          Old Apr 7, 2010 | 08:25 PM
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            #65  
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          From: mahwah, NJ
          can you put a 5.4 from a 00 f150 windsor in a f250? will it bolt up?
           
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          Old Apr 7, 2010 | 09:00 PM
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          Originally Posted by JMC
          That is much more complicated to do. Sorry but these notes only cover the 2 Valve 5.4 swap.

          .
          JMC, after reading all the posts here I think your earlier assessment was correct. You should have just made the post and not answered any additional questions. You kinda dug yourself a hole with this one. But its a great informative subject and I have learned a bit here. I'm currently changing engines in a '98 Expedition from a 4.6 SOHC to a 4.6 DOHC and I find a lot of the info here is helpful. Thanks.
           
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          Old May 27, 2010 | 10:40 PM
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            #67  
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          From: Eastland/Stephenville, Tx
          Originally Posted by JMC
          Notes for 4.6 to 5.4 swap Part 1 Revised 4 May 2009

          Exhaust: The collectors on the exhaust manifolds are set at different angles and locations. The 4.6 exhaust might not bolt up to 5.4 manifold. You may need to have a muffler shop modify your 4.6 exhaust to match up.
          I'm switching from 4.6l to 5.4l s/c (L motor). If the exhaust manifolds are the same, just set at different angles, would I be able to use the manifolds off my 4.6l and have them match the exhaust at the correct angle?
           
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          Old May 28, 2010 | 03:04 AM
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          Originally Posted by 1clean42
          I'm switching from 4.6l to 5.4l s/c (L motor). If the exhaust manifolds are the same, just set at different angles, would I be able to use the manifolds off my 4.6l and have them match the exhaust at the correct angle?
          Asp "L" exhaust manny's are different than NA modular V8's. Their a little larger.

          In case your unaware.
           
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          Old May 28, 2010 | 10:36 AM
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          Originally Posted by 1clean42
          I'm switching from 4.6l to 5.4l s/c (L motor). If the exhaust manifolds are the same, just set at different angles, would I be able to use the manifolds off my 4.6l and have them match the exhaust at the correct angle?
          The 5.4 is wider than the 4.6 so regardless of the manifold that you use it will not line up.

          .
           
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          Old May 28, 2010 | 03:09 PM
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          Yeah, I thought of that right after I posted...was talking about it with my dad and that came up (the width of the motor causing the different angle). Thanks though!
           
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          Old May 29, 2010 | 09:11 PM
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          So if I'm planning on buying headers, will regular 5.4l headers work with the Lightning motor? Or do I need headers made for a Lightning?
           
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          Old May 30, 2010 | 02:57 AM
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          There is no difference between a regular 5.4 or a lightning 5.4 header.

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          Old Jun 15, 2010 | 10:29 AM
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            #73  
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          From: Huntsville, AL
          if you have an 02 4.6, so it has COP, and a 5.4 donor, can you just use the 5.4 harness and computer for the swap? I have a donor and i was hopin id just need to change things like the stall converter and other little things without the need to splice? will it drop right in?
           
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          Old Jun 15, 2010 | 02:32 PM
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          Originally Posted by supercrewfx4
          if you have an 02 4.6, so it has COP, and a 5.4 donor, can you just use the 5.4 harness and computer for the swap? I have a donor and i was hopin id just need to change things like the stall converter and other little things without the need to splice? will it drop right in?
          Nope. Your 4.6 PCM is programmed to work with the instrument cluster in your truck. The truck will not start using the 5.4 PCM.

          .
           
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          Old Jun 15, 2010 | 03:44 PM
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            #75  
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          From: Huntsville, AL
          Originally Posted by JMC
          Nope. Your 4.6 PCM is programmed to work with the instrument cluster in your truck. The truck will not start using the 5.4 PCM.

          .
          can ford reprogram the 5.4 pcm to work with the cluster?
           
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