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Unread 12-22-2010   #1 (permalink)
ford87boy is offline Rookie

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Default 4.6 2v to a 4.6 4v swap ,2002 Mustang

i currently have a 2002 gt with a 2v 4.6 with slp loud mouth cat backs 3.73 gears an a k&n cold air intake, i wanna take that motor out for a 2003 supercharged 4.6 4v motor. what do i have to chage in order to make everything work right can i reuse my wireing harness n fuel system or do i have to change all that n upgrade everything
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Unread 12-22-2010   #2 (permalink)
99RedGt is offline Apprentice


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let me know what you find out.. I'd guess you are going to have to change everything because ur gonna need more fuel... but let me know cuz i was thinking about new ideas to do to my 99 gt... i also have an exhaust
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Unread 12-22-2010   #3 (permalink)
red1999cobra is offline Senior Member

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you must have some mad cash to do a swap like that. engine alone is gonna cost u.
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Unread 12-22-2010   #4 (permalink)
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First off you can do this two ways one is to just swap the heads and timing chains to make it 4 valve. Of course you will also have the cams changed as well. If you go your route of an engine swpa then you will find that most all the harnesses will be the same and the ECM will need reprogramming and such. There is no difference in the basic blocks between the 2 and 4 valve systems and most of the parts will be inter changable with the heads and valve covers being one of those changes. You will need to have the Maf and the injector sizes reprogrammed into the ECM but if you can get the computer with the motor then you will be aheady of most of it. The supercharger will be what gained you the most and you want to be sure that engine is all in good order first before buying it and putting it in. But it would be a great Christmas present for the auto geek s and one you will never really stop tweaking on even when its going perfectly.
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Unread 12-22-2010   #5 (permalink)
clintbaum is offline PONY Member


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If you are wanting big gains you will have to rebuild the bottom end with forged internals, the stock stuff wont take the power from the heads and supercharger. So really it might just be cheaper to get a 4v crate motor and get a kenne bell supercharger. Either way its not gonna be cheap, at least 10 grand in just the motor, probably more.
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Unread 12-22-2010   #6 (permalink)
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theres a million threads on this. use the search button at the top for more info.
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Unread 12-22-2010   #7 (permalink)
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Quote:
Originally Posted by quik00gt View Post
theres a million threads on this. use the search button at the top for more info.
He's right. This question comes up at least twice weekly. If everyone that asked about it actually did it, there wouldn't be any '03/4 Cobra engines left on the planet still actually in '03/4 Cobras. They'd all be in GT's and V6's. :hihi:
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Unread 12-22-2010   #8 (permalink)
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BTW, you could far more easily install and afford a f/i set-up with all the goodies necessary to get the horsepower from your 2v that a stock '03/4 Cobra 4v would make. It still won't be cheap, though.

my .02
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Unread 12-22-2010   #9 (permalink)
ford87boy is offline Rookie

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thanks everyone um i didnt know i could put 4v heads on a 2v motor, but thanks everyone for the help i wanna build a street/strip mustang i had a 93 gt that ran 10.5 n i streeted that car as well even tho the cops didnt like that very much n id like to repet that with my new car since i dont see very many heavly modded mustang that yr
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