3.8 to 4.2? - Mustang Evolution

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Old 08-25-2014, 02:18 PM   #1
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3.8 to 4.2?

I have a 2000 3.8 n I wanna make it to a 4.2 but I dont kno how to do it. What parts would I need n what r the steps to complete it? Is it easy anuff to do myself? I have over 230, xxx miles would it b worth it or just junk the engine n put a newer one in there?

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Old 08-25-2014, 02:33 PM   #2
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Just find a complete lower mileage 4.2, use your upper intake. Bolts right up. Use the 4.2 flexplate/flywheel and harmonic balancer.
I had to take a pilot bearing out since my cars auto, and the engine came out of a manual truck.

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Old 08-25-2014, 03:28 PM   #3
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Its a 5 speed. From what year F-150 will fit my 2000 3.8

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Old 08-25-2014, 08:04 PM   #4
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Any year, i think the 97-98 4.2's need to have some studs cut or something...
Anything newer is a direct swap.
Same engine externally, different crank and pistons.

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Old 08-25-2014, 11:21 PM   #5
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How much of a hp increase is this swap?
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Old 08-26-2014, 02:07 AM   #6
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Only like 10 using factory parts.
No replacement for displacement and a 4.2 is a bit easier to find I think.
About the same price too.
The 4.2 was also fords last pushrod engine made, ending in 2008.

With a Windstar intake, cam and gears it'll wake up.

My 4.2, with the old singleport heads, a stock 4.2 cam, cai and with a 8.8 with 3.27 gears runs mid 15's with an automatic tranny.
Not a lot of HP it makes like 210 tq to the wheels at just 2000 rpms. Which is nice...

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Old 08-26-2014, 05:27 PM   #7
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Really I have full bolt-ons 373 7.5 n tlock long tubes hpipe tune n im hittin high 14s

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---------- Post added at 05:27 PM ---------- Previous post was at 05:27 PM ----------

Ive hurd with a good tune its up to 50 rwhp

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Old 08-27-2014, 02:21 AM   #8
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Well 3.73's are better than 3.27's, and the 99-04 split port heads flow a lot better?

A good tune is 10hp at BEST, diesels can get like 50+hp from a tune.
Gas engines are different though.

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