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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 12-08-2010, 11:28 AM   #11
MU71L4710N
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i would 4v swap it. you should be able to find a complete cobra motor in a junk yard for far less than 2 grand, you can get the heads cleaned up, i wouldnt bother with cams unless your power levels absolutely require it which i doubt they do, and don't forget you can sell the extra gt parts and cobra shortblock to recoup $.
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Old 12-08-2010, 12:18 PM   #12
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Quote:
Originally Posted by Kerns View Post
B heads outflow C heads... and 03/04 Cobra heads are C heads. Although 03/04 Cobra C heads do outflow B heads, but only marginally so. Not sure it would be worth the extra 700-800$ for a very minor difference in flow numbers.
im very curious as to where you are getting your information from because 03 cobras definitely do not have a c casting head...
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Old 12-08-2010, 12:28 PM   #13
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Quote:
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B heads outflow C heads... and 03/04 Cobra heads are C heads. Although 03/04 Cobra C heads do outflow B heads, but only marginally so. Not sure it would be worth the extra 700-800$ for a very minor difference in flow numbers.
C/Tumble Port: (99/01 Cobra, 99 Lincoln Continental)

http://lmgtfy.com/?q=4v+modular+heads

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Old 12-08-2010, 03:11 PM   #14
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Click the image to open in full size.

03/04 Cobra heads are tumble port design just like the 99/01 heads. They are essentially a revised C head.
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Old 12-08-2010, 03:30 PM   #15
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I just bought a complete 96' MarkVIII engine and a set of Modmax H beam rods for $400, an intake and basic rebuild will not be anywhere near the $2,600 mark for TFS. You wouldn't need high lift valve springs or any of that unless you are wanting to build a full race engine as the 4V heads do not require the high lift cams to achieve higher flow.
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Old 12-08-2010, 03:32 PM   #16
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I don't know what your driving habits are or if this your daily driver, but a 600RWHP DOHC motor will be much more civilized and streetable than a 2v motor in the same ball park.

Are you sticking with the vortech? Or are you thinking about another power adder, like a Kennebell or Turbo or?
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Old 12-08-2010, 03:33 PM   #17
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Quote:
Originally Posted by Jay-rod427 View Post
I just bought a complete 96' MarkVIII engine and a set of Modmax H beam rods for $400, an intake and basic rebuild will not be anywhere near the $2,600 mark for TFS. You wouldn't need high lift valve springs or any of that unless you are wanting to build a full race engine as the 4V heads do not require the high lift cams to achieve higher flow.
Exactly, the SOHC Trick Flow heads with high lift cams will have an extremely rough idle, but that might be what he wants.
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Old 12-08-2010, 03:49 PM   #18
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what lift are you going by when you say the B head outflows the C head? if you are going by the .500 as your determination than you would also have to apply that logic to the NPI VS PI and you could say the NPI out flows the PI and therefore is a better head but everyone know the NPI is a POS head.
There are so many variables for each build that determine what is the right choice not just flow at .500
Most 4V people agree that the C head is the better option when it comes to the 4V
just my .02 but MF is the last place you need to ask this kind of technical question. you are better off over on SVTP or the Corral for real accurate info
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Old 12-08-2010, 03:54 PM   #19
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Originally Posted by schmallz View Post
I don't know what your driving habits are or if this your daily driver, but a 600RWHP DOHC motor will be much more civilized and streetable than a 2v motor in the same ball park.

Are you sticking with the vortech? Or are you thinking about another power adder, like a Kennebell or Turbo or?

and you know this how? I daily drived a 600rwhp+ 2v with a vortech for 2+ years, it wasn't that rough of an idle.
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Old 12-08-2010, 04:31 PM   #20
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I wouldn't think a s/c would be that rough...i think it'd be the cams/intake/gear combo etc..

LIke my cars a lil more rough off idle, but then again i have a pretty big set of 2v cams and such.
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Old 12-08-2010, 04:31 PM
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