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are these heads worth getting, they are a lil expensive but very high quality http://www.patriot-performance.com/ check out the ford 4.6-5.4 heads, it supposed to be about a 140 horse bolt on with good cams and headers and a few little mods and pi intake, i want the stage 2 with some good cams in each one
 

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Refrigerator Raider Hater
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I have heard some iffy things about them. There are ways of skewing the flow numbers, like not using a bore.

Also, flow numbers aren't everything. From those pics it looks like they remove the swirl dam. Even with the same flow numbers, a head with the swirl dam will make more power (better air/fuel mixing and slightly higher compression). Removing the swirl dam is a shortcut to better flow at the cost of efficiency.
 

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I've been advised that on a blown application, with high boost, removing the swirl dam actually improves power. They may have been wrong though. On a N/A application, I'd leave it in though.

Dan
 

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Refrigerator Raider Hater
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Well there is debate over whether to remove it on a SC motors or not, but almost everyone agrees it should be left on for NA motors.
 

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Real Ultimate Goatse Hunter
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GreenBird said:
I have heard some iffy things about them. There are ways of skewing the flow numbers, like not using a bore.

Also, flow numbers aren't everything. From those pics it looks like they remove the swirl dam. Even with the same flow numbers, a head with the swirl dam will make more power (better air/fuel mixing and slightly higher compression). Removing the swirl dam is a shortcut to better flow at the cost of efficiency.
You know that the SVO heads don't have a swirl dam right? That would be the least of my worries, J can take care of any problems that might come from that (and I went over a year without a tune after the swap).
 
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