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

3.8 to a 4.2 stroker question

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Old 10-19-2011, 05:16 AM
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picky
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Default 3.8 to a 4.2 stroker question

Can it be done with OEM parts??

Been hearing a various number of stroker options from an f150 or a winstar?

which year f150 am i supposed to be looking for?

i want to source out some of the parts at a local wrecking yard.
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Old 10-19-2011, 05:31 AM
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mods delete thisthread i made 2 by accident. my apologies.
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Old 10-19-2011, 09:17 AM
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LilRoush
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I don't see the other thread, so I'll just answer here. The F150 is what you are looking for. Yes, you can swap it using all OEM parts. I want to say it's the '97+ 4.2L that you are looking for. You want the 01-04 fly wheel (internally bal) and your Mustang upper intake manifold. (You can also use the Windstar upper, but the F150 upper is too big to fit under your stock hood.)
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Old 10-19-2011, 10:53 AM
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mustangmike09
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Pretty easy swap if you have the tools. Same block, I pulled my 3.8, swapped over the oil pick up tube, oil pan, motor mounts, sensor on the block idk what it was lol. I used an 07 4.2 i believe, got it off ebay from a company that was bought out by LKQ. Kinda expensive for the engine but I went with a low milage to be picky. 27k miles after shipping was like 900 bucks, also wanted new heads cause I had a valve cover bolt break off into my stock head. Didn't have any problems with it leaking oil there, I put RTV around that side also, still didn't want that in there though lol

Any more questions, just ask, its a very simple swap.
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Old 03-09-2012, 06:36 PM
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Danielsmustang
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When you guys say its a simple swap, how simple are we talking about? I have been doing research, but i cant find something to tell me straight up what i have to do. From what i heard from several forums, i gathered that the 4.2 has the same block, i should use the windstar upper intake but its too high for my stock hood, i coud swap the heads, because they fit and pretty much the rest are small stuff. Now if this is true, how much gain in performance would i be looking at? because im in between this, or just buying new heads and porting my lower intake and exhaust ports.
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Old 03-10-2012, 06:30 AM
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LilRoush
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Windstar fits under a stock hood. The stock 4.2L doesn't, you need the Windstar or use the Mustang upper.

More or less you need the 4.2L motor, a 3.8L oil pan from 01-04 (the earlier pans won't fit the 4.2L crank). if you just used the short block, you can use the Mustang heads, lower/upper intake and all the belt driven parts up front. Mustang headers/exhaust manifolds are used. Use the 4.2L crank pulley and flywheel.
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Old 03-10-2012, 10:05 AM
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Danielsmustang
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Originally Posted by LilRoush
Windstar fits under a stock hood. The stock 4.2L doesn't, you need the Windstar or use the Mustang upper.

More or less you need the 4.2L motor, a 3.8L oil pan from 01-04 (the earlier pans won't fit the 4.2L crank). if you just used the short block, you can use the Mustang heads, lower/upper intake and all the belt driven parts up front. Mustang headers/exhaust manifolds are used. Use the 4.2L crank pulley and flywheel.
Thank you. Okay So if i do that, How much hp would i be looking at? If i decide to use the windstar from the 4.2L i cant use my mustang lower right? Because i heard the windstar is a split port and my upper is a single port.
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Old 03-10-2012, 10:43 AM
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LilRoush
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Ah, I missed your year.

You can use your heads/intakes to keep it easier, or do the split port swap while you're at it and scoop more power.

A stock 4.2L (split port) is on par with the pushrod 5.0L for power.
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Old 03-10-2012, 10:53 AM
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Well in that case, it would be easier to just do a full swap right? I get the 4.2l Change the oil pan, And flywheel and use the rest from the 4.2L
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Old 03-25-2012, 11:52 PM
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BabyGT
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So wait? Is this all plug and play with sensors and all? Will the 3.8 computer run the 4.2? How bout ac and power steering? Wait I guess since the block is the same the ac and steering will be too?
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