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1.out of the box how do they compare to a ported 906 head?

2.can you buy them un assembled?

3.is anyone using them and whats the noticed difference from what you had?

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I have not used mine yet, I have seen posts on here from people who have had them flowed and they flowed better than the professionally ported big valve 906 heads that I have had flowed and used on my car and other motors that I have built and dyno tested for customers IHTHs Call 440source for question # 2 I wanted 3 sets of the bare castings and ended up with one set of the complete heads, I ended up having to cancel the other sets due to the slowing of the economy and so on. The so on is that I ended up buying a set of ported B1 from Koffels and a set of 440-1 from another member on here you know the old adage "go big or go home"