Changing to a 4.2L? - Mustang Evolution

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Old 09-23-2009, 12:16 PM   #1
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Changing to a 4.2L?

Im 18 got my 3.9L v6 04 mustang for my first car and besides a K&N cold air intake i havent done anything. I read in threads that turning it to a 4.2L would be good. How much is it gonna cost. how is it done? im ok on cars but idk what exactly needs to be switched? any adjustments to the chip, tranmission, backend? Am i swapping out for an entirely new engine? and what problems am i gonna run into.
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Old 09-23-2009, 04:50 PM   #2
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Re: Changing to a 4.2L?

You would have to remove your stock engine and either bore and stroke your engine or buy an already built engine. The computer will have to be retuned, but everything else will go right back.
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Old 09-23-2009, 05:27 PM   #3
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Re: Changing to a 4.2L?

This should give you some guidance:

http://www.mustangevolution.com/forum/t9601/
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Old 09-25-2009, 10:55 AM   #4
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Re: Changing to a 4.2L?

01-up split port heads

- 4.2 shortblock or longblock
- You can use the 4.2 heads
- Mustang upper and lower intake and fuel rail
- Mustang 3.8 water pump
- Auto trans = your stock flexplate
- 5spd = your stock flywheel and a pilot bearing
- V6 Mustang bellhousing
- Re-use your stock cam position sensor
- Your 01-up 3.8 oil pan
- Your 01-up 3.8 oil pick-up tube and screen
- Your stock 01-up 3.8 damper
- Re-use the stock 3.8 oil pressure sender and tube
- Re-use the Mustang headers
- You can use the 4.2 or 3.8 dipstick. Just keep track of where 5 qts puts the mark when refilling with oil.

will all this be compatible with my 3.9L its alot like the 3.8 and idk the differences but it sounds like it should work. my only question from here is what is a good car that i can pull the engine out of in a junkyard?
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Old 09-25-2009, 02:45 PM   #5
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Re: Changing to a 4.2L?

Maybe a ranger or an explorer, that's my guess :dunno:
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Old 09-25-2009, 07:40 PM   #6
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Re: Changing to a 4.2L?

I'd take it out tear it down replace bearings clean everything up then bore it. And get a crank from a ford truck. Its alot more fun.
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