Engine Compatibility
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Engine Compatibility
New to the forum so I apologize if my question has already been asked, and answered. I have a 2006 F150 with a 4.2 V6 engine that I am considering replacing. I would like to know what other engines are compatible with this truck, or how to determine this for myself. I would also like to hear opinions on the quality / reliability of the various re-manufactured engine providers. Thanks in advance.
Elder User
Joined: Aug 2018
Posts: 579
Likes: 7
From: Riverbank, CA.
You're about to open a can of worms
Swapping motors ain't like the old days. Between the PCM, the gauge cluster and other various electronics you'd be opening a veritable can of worms.
Having said that, if you can source a 4.6 or 5.4 along with the matching PCM and gauge cluster you might be able to do it. But in all seriousness, maybe you should look at selling your current truck and purchasing another. The newer Ecoboost V6's are the motors to beat these days.
Having said that, if you can source a 4.6 or 5.4 along with the matching PCM and gauge cluster you might be able to do it. But in all seriousness, maybe you should look at selling your current truck and purchasing another. The newer Ecoboost V6's are the motors to beat these days.
FTE Community Team
Joined: Jan 2019
Posts: 10,745
Likes: 1,498
Agree with the others.
Directly compatible? A 2006 4.2 liter Ford V6
Could have been installed in this truck's body at the factory? Your 4.2 V6, a 4.6 V8, or a 5.4 V8 .
Could have been installed in this truck's body at the factory? Your 4.2 V6, a 4.6 V8, or a 5.4 V8 .
Fleet Mechanic
Joined: Jan 2007
Posts: 1,293
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Really save a lot of time and trouble by considering rebuilding and possibly upgrading your existing engine. The 4.2 should be capable of an easy 300 HP but I'll admit I'm not a 'tuner' and don't know exactly how to get it. Just to do the basic hot-rodding things to it (improved intake system and exhaust system, premium fuel, revised ECU tuning) should produce another 50 HP which might be attractive to you. If you go to the next stage with higher compression, special heads and camshaft, that's when you'll get into the real HP.
I have a 3.31 rear so one of the best things I could do for performance is put a 3.73 in it. But then my first gear would be too low to use except for stump-pulling.
This would make me want to put in an automatic instead of the 5-spd, so like they say, now you're getting into too much electronics to make the trans work with the ECU.
I have a 3.31 rear so one of the best things I could do for performance is put a 3.73 in it. But then my first gear would be too low to use except for stump-pulling.
This would make me want to put in an automatic instead of the 5-spd, so like they say, now you're getting into too much electronics to make the trans work with the ECU.
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
Really save a lot of time and trouble by considering rebuilding and possibly upgrading your existing engine. The 4.2 should be capable of an easy 300 HP but I'll admit I'm not a 'tuner' and don't know exactly how to get it. Just to do the basic hot-rodding things to it (improved intake system and exhaust system, premium fuel, revised ECU tuning) should produce another 50 HP which might be attractive to you. If you go to the next stage with higher compression, special heads and camshaft, that's when you'll get into the real HP.
I have a 3.31 rear so one of the best things I could do for performance is put a 3.73 in it. But then my first gear would be too low to use except for stump-pulling. This would make me want to put in an automatic instead of the 5-spd, so like they say, now you're getting into too much electronics to make the trans work with the ECU.
I have a 3.31 rear so one of the best things I could do for performance is put a 3.73 in it. But then my first gear would be too low to use except for stump-pulling.
This would make me want to put in an automatic instead of the 5-spd, so like they say, now you're getting into too much electronics to make the trans work with the ECU.What else are you going to recommend a throttle body spacer or a E turbo? Seriously the 4.2 and easy 300hp just isn't a thing. There is nothing that will make them gain 98 hp over stock without exceeding the cost of the truck. The 4.2 is known to pull about 140hp 200tq on the dyno in good stock form, it's no powerhouse.
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Fleet Mechanic
Joined: Jul 2019
Posts: 1,316
Likes: 313
Yeah, unfortunately 300 ponies from a 4.2 probably isn’t going to be all that usable in an F150, either. I mean, the later 3.7 trucks get there, but it involves a few thousand more RPMs, variable cam timing, three more cams and twelve more valves.
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