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Old 08-02-2004, 18:07   #1 (permalink)
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Difference?

Another worthwhile question from the newbie. What is the difference between 2v and 4v in the wide world of Ford. I have seen this in reference to heads for the most part but I'm curious.

thanks

dale
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Old 08-03-2004, 17:34   #2 (permalink)
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Re: Difference?

The difference is the size of the inlet & exhaust , the 4v being much larger.
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Old 08-03-2004, 17:48   #3 (permalink)
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Re: Difference?

The 2V and 4V means the heads were originally designed to run with either 2 or 4 Venturi carbs. Venturi is the correct word for the throats in a carb. So when you hear 4 barrell for example that means 4 venturis.

Generally speaking a carb with 2 venturis will flow less than a 4 barrell so this is why the 2V heads have alot smaller ports on both exhaust and intake sides. You will also hear 2v and 4v used when talking about intake manifolds and exhaust manifolds. Just means which head they were designed for.

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Old 08-03-2004, 21:56   #4 (permalink)
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Re: Difference?

xespack has the factory description.... but to most aftermarket parts makers/mechanics 2v refers to 'small port' and 4v refers to 'large port' heads.

In the clevelands, the 4v heads are so big that most people use 2v's with 4 barrell carbs to get some form of low rpm performance out of the engines. There is also open and closed chamber versions of both heads available too.

As far as BB ford engines go... i'm just learning myself :)
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