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Old 04-26-2014, 10:22 AM   #1
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4v Cobra heads

Just curious, went with my dad to drop a car off at a suspension shop in Raleigh(Same Guy I bought my cobra trans off of) and saw he had two 4v cobra heads sitting in the corner for sale.
I was wondering if they would even work on a 98 GT.
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Old 04-26-2014, 10:32 AM   #2
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They would, but you need a lot more to do a 4v conversion. And depending if they're B heads or C heads, would be a big difference too......
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Old 04-26-2014, 12:36 PM   #3
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Quote:
Originally Posted by Roguestang View Post
They would, but you need a lot more to do a 4v conversion. And depending if they're B heads or C heads, would be a big difference too......
What's this differences this is new to me?

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Old 04-26-2014, 01:24 PM   #4
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4v Cobra heads

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What's this differences this is new to me?

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B head = 96-98 cobra & mark 8
C head = rest
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Old 04-26-2014, 09:04 PM   #5
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B heads are split/swirl ports, C heads are tumble ports. 03/04 heads have a better short turn radius and a few other things to make more power. 05 Aviator heads and all FRPP heads were 03/04 style with 8 thread spark plug holes. Intake manifolds are different between B and C heads as well and are not compatible. Then there are the IMRCs on the B headed cars as well as the issues with the secondary ports getting all crudded up because there is just air and no fuel going in there. An EGR delete can help this immensely though.

You will hear from everyone that "omg B heads flow more=better head". This is a load of crap. B heads technically do flow more at the very top of the RPM band but unless you are running a metric assload of boost this means nil and even if you are... it still means nil. With that said, B heads are way more plentiful than C heads right now and they can make great power, you just have to run a steep gear because they are a bit anemic down low.

edit: Also, you can get B heads for free if you look. Don't pay for them. They are a high supply, low demand item if those are B heads the guy is trying to sell.
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