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Old 09-28-2015, 04:16 PM   #1
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5.4 help??!!

Other than the obvious what's the benefit of using the 5.4 motor over the 4.6? I have an on3 kit now but was wondering about the 5.4 just for the added cubic inches?


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Old 09-28-2015, 11:23 PM   #2
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More torque means you aren't going to have to rev it out as much when driving around. Lower RPM = less wear on bearings and **** in your transmission.

Butyea, the point is more cubes
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Old 09-28-2015, 11:35 PM   #3
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The 5.4 is the same bore as the 4.6, just a much longer stroke. Between a 5.4 and 4.6 there isn't a big horsepower difference but you get a ton more torque.


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Old 09-29-2015, 03:36 AM   #4
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If they are the same 5.4's that were used in the F150's, steer clear from any that had a build date before 2007. The 2004 to early 2007 had issues with the spark plugs; when it was time to change them, they could break off due to a two piece design. They got replaced with a one piece design, but getting out the early two piece plugs usually required a special tool to remove the ones that would break off in the cylinder heads (carbon build up on the threads that stuck out in the combustion chamber caused them to seize when removing). The early 5.4's also had early cam-phaser wear issues (ticking sound was an indicator that they needed replacement), again resolved in the later years.

Those who have the 5.4 in the F150 swear at them, or swear by them for their great torque.
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Old 09-29-2015, 04:26 AM   #5
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So let me ask this. I have a turbo kit would you build a 5.4 and go turbo or build the 4.6?? Turbo plus the 5.4 torque sounds pretty nasty in my head!!


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Old 09-29-2015, 06:10 AM   #6
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I'd build the 4.6 unless you find a 5.4 from 2009 or later

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Old 09-29-2015, 08:02 AM   #7
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So let me ask this. I have a turbo kit would you build a 5.4 and go turbo or build the 4.6?? Turbo plus the 5.4 torque sounds pretty nasty in my head!!


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Make sure it is not one of the 5.4s that have the spark plug problem.

If you combine that spark plug problem with boost, you might get a plug or two giving you problems.

It would be nice to have the 5.4 torque with the boost, but you want to watch out for the ones with spark plug issues. Id imagine there is a way around this problem- Either a head swap or a revised spark plug design that you can retrofit.

One thing is certain: You're taking a risk by boosting an engine that has shifty spark plug design
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Old 09-29-2015, 09:02 AM   #8
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Was looking at stroker cranks this morning it would be a lot cheaper building the 5.4 as to stroke the 4.6 for sure but I sure don't want to build a problem by any means!


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Old 09-29-2015, 09:32 AM   #9
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Was looking at stroker cranks this morning it would be a lot cheaper building the 5.4 as to stroke the 4.6 for sure but I sure don't want to build a problem by any means!


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Idk if I would do a stroker unless you really want cubes.
Id rather bore it out, if anything.

Negative side to stroking

- Too much compression with a turbo (Deck height is shorter on 4.6)
- Lower revving (for a number of reasons)
- Will have to run shorter con rods = more side load on piston
- More side load on piston + Turbo = ehh
- Wont really be able to increase displacement very much.
-Will unbalance the square bore:stroke ratio of the 4.6, which is actually quite good.


If you do a stroker, stroke out a 5.4. There is not that much to work with on a 4.6. At least the 5.4
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Old 09-29-2015, 03:14 PM   #10
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Well deck Height of the 5.4 and clearance problems with hood and that intake. Lord Iam just going to shoot for at least 5.0 out of my 4.6 call it day! Damn I want a fox body and a push rod motor again! I swear I don't remember mess being this complicated back in the day!! Lol


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Old 09-29-2015, 04:53 PM   #11
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If you want a really badass build. Get a Boss Block, and put a stroker in that. The Boss block allows for a 3.7" bore, then if you stroke that you can end up with 5.3L. Throw a set of TFS heads on and you can make 400rwhp NA, add boost into that and you are looking at some damn good power out of what was once a 4.6.
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Old 09-29-2015, 05:01 PM   #12
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get a 454.
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Old 09-29-2015, 05:49 PM   #13
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Was thinking of a Chevy 573 Brodix motor! Built ford tough with Chevy stuff! Lol I'd rather blow a donkey than put a Chevy motor in my car! Was talking to my motor guy today his best recommended path was build the 4.6 good heads intake and cams boost the piss out of it.


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Old 09-29-2015, 06:27 PM   #14
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Was thinking of a Chevy 573 Brodix motor! Built ford tough with Chevy stuff! Lol I'd rather blow a donkey than put a Chevy motor in my car! Was talking to my motor guy today his best recommended path was build the 4.6 good heads intake and cams boost the piss out of it.


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"brodix bbc"
Starting to wonder about those chevy guys now
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Old 09-30-2015, 06:53 AM   #15
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just get the engine, and extract the spark plugs and use the redesigned. a lot of the early 3valves had this issue. mustangs included. the trucks seemed to get it worst tho. but either way, its not the end of the world. just calculate the tool to extract them as your cost, and change the plugs asap, then replace with a redesigned model.
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