Head flow and power differences question / discussion

Brian Hafliger said

We've made just under 580HP with them, using a hyd. roller cam! But they need work, they were not ootb heads at all. Compression was 10.7:1.

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We made a touch more than that with ootb ports but the heads themselves were not ootb. I had them disassembled and gone through. A few guides were a little tight.