4.6 sohc to 5.4 dohc - Forums at Modded Mustangs
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post #1 of 29 Old January 4th, 2009, 11:40 AM Thread Starter
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4.6 sohc to 5.4 dohc

Is somebody trying a 5.4 dohc on a gt?
I know the clearance problems on the hood and with the exhaust, but my question is more about ignition and fuel injection timing.
I know both engines use the same ckp and cmp sensors as well as the trigger wheels, but i would like to be 100% sure that the stock computer would make the correct timing. Any info would help. Thanks
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post #2 of 29 Old January 4th, 2009, 11:51 AM
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The biggest problem is the price of the intake. Everything else is nominal "IF" you're staying NA. The other problems come into play for supporting all the Tq, rear end, Trans and of course tires. I honestly don't think the Tq gains are worth the extra cost, unless it's something you "really" want to build or you already have the long block.

Here's my buddies old car.
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post #3 of 29 Old January 4th, 2009, 12:47 PM Thread Starter
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I got the 5.4 out of a 2000 navigator for 300 dlls, i also have the hole wiring harness and computer but i dont want to change the harness or the computer if it is not necessary. I think hps makes an intake for like $700, do you know any other options?
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post #4 of 29 Old January 4th, 2009, 01:11 PM
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ummm no hps only makes an intake manifold for the 2v not the 4v. i think for the 4v you have to use an aussie intake or a boss intake or something to that effect?
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post #5 of 29 Old January 4th, 2009, 02:37 PM
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I am also curious about this topic. I have a non-running 5.4 sohc now that I got for free. I know a guy who will sell me a running 5.4 dohc for $500. What to do, what to do....


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post #6 of 29 Old January 4th, 2009, 02:41 PM Thread Starter
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Where can I get those intekes from? How much are they?
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post #7 of 29 Old January 4th, 2009, 03:10 PM
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The one that's on my buddies is custom. IDK who makes the intake, but I know they are made. Reichart racing (sp) used to make one.
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post #8 of 29 Old January 4th, 2009, 06:39 PM Thread Starter
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Ok thanks. If there's no problem using the stock computer i'll go for it.
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post #9 of 29 Old January 4th, 2009, 07:15 PM
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Ford 5.4L DOHC single plane intake manifolds

I have a bit of information on doing the swap as well. I was going to build one myself but after pricing everything out I found I could build a push with more power for half the cost, 5.4 4valves look sweet in the engine compartment. As far as headers you may want to check with Kooks or Accufab to see if they make or have made them. You will be able to use the factory harness but you will need to lengthen some of it, the obvious is needing a tune. Good luck and be sure to take lots of photos to document your progress, it will be useful to help others that do the same swap and it is nice to look back at what you started with.

Just another 10 second Mustang, what did you expect ? http://youtube.com/watch?v=BgykaUrmfvM
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post #10 of 29 Old January 4th, 2009, 08:24 PM
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MMR widens B headed 4.6 intakes to fit the 5.4...
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post #11 of 29 Old January 4th, 2009, 09:10 PM Thread Starter
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As soon as I start the project I will post some pictures, thanks.
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post #12 of 29 Old January 5th, 2009, 10:20 AM Thread Starter
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Any ideas of what is the best way to go on changing the fuel rail to a return type, cause I think the 2000 nevigator uses a returnless type system.
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post #13 of 29 Old January 6th, 2009, 05:40 PM
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you don't have to change... keep your existing fuel system and just put the motor in. one doesn't necessarily require the other.

The HPS intake is available at 54

I recommend staying with the valve arrangement you have on your car if you want to do the swap. That keeps it retardedly simple. 2v stay 2v, 4v stay 4v. v6 can go either way but I'd recommend 2v as much of the GT and V6 parts are shared. The cobras get a lot of non-standard bits.

Header dyno results coming next week in theory. I'll keep y'all updated. Just finished moving into the new house so I'm back on the stang project.
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post #14 of 29 Old January 6th, 2009, 11:58 PM Thread Starter
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The thing is that i have the 5.4 dohc already, and that hps intake wont fit on a 4v. I probably use the navigator computer so i can run cop and get it tuned.
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post #15 of 29 Old January 7th, 2009, 10:36 AM
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no ...you don't have to run a different computer. It's just a tune! You can flash the stock ECU with a tune that'll run the thing just fine using a handheld and a mail order tune. It should be able to start and run the engine without a tune but I like to apply at least a base tune before the first fire up (the 4.6 factory tune won't idle a 5.4 well) if at all possible and then take it in to a dyno for final tuning. You can use coil packs to light the fires if your car is a 96-98, you don't need COP.

As for doing the 4v, it's a good bit more involved than just swapping in the bottom end and slapping your existing 2v heads on it. The power returns tend to be worth it but simplicity is out the door on that and cost goes up almost double.

My strategy has been to start with just ported 2v heads and hot cams, then I'll upgrade later on to the Trick Flow 2v heads or a set of hogged out 3v heads. I've got longtubes being made for that setup. HPS is considering doing a 3v intake based on the 2v intake as well which would make for a simple bolt in 3v upgrade and the potential for lots more top end. I had originally planned on going 4v but the flow numbers from the TF heads and ported 3v heads are close enough that I'll take the weight/cost/complexity savings and use nitrous to make up any difference.
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post #16 of 29 Old January 7th, 2009, 12:11 PM
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if considering 3v swap. look into logan motorsports' Sn95 3v conversion.

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post #17 of 29 Old January 7th, 2009, 01:38 PM Thread Starter
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Ok, if there's no problem running my stock computer than i'll run with my coil packs and get a tune like you said.
Can I use a cobra flywheel? Because I have to change it to an 8 bolt. If I do that I need to change the clutch too?
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post #18 of 29 Old January 9th, 2009, 01:31 PM
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you can use a cobra flywheel. It should work just fine with your stock clutch. If you're in a 00' or earlier car you should have no trouble.

note, 01.5-04 cars came with an 11" clutch. Earlier cars use the 10.5"
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post #19 of 29 Old January 13th, 2009, 12:40 PM
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My swap is almost done ! i only need to fix the mid pipe(pro chamber and it's done !
here's 2 small clip of it
more video to come !
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post #20 of 29 Old January 13th, 2009, 12:58 PM Thread Starter
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that's awsome, what was the stock engine dohc or sohc? where did you get the intake manifold from?
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