Originally Posted by Diplomat360
The part of the guide casting that connects the guide to the roof of the port could be removed as well.

That is what I did on my '596 heads and that netted a few extra CFMs.

Somewhat hard to tell all the details, but here are a few pics:

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I put enough work into these that will end up thrown into the corner with a pile of other heads. I thought these went 240 with a 1.88 cut into them. Actually it was 204, so I tried to save face a little. 230 and I'm done lol. I put 2.02's into some 360 heads (974's) and got 250 with less work than these. What did your 360's go?