X head milled to closed chamber ?

skrews said

Just found it interesting. Kind of a fools endever these days.

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I always want the thickest decks, the thickest bores, thickest head surface, highest valve seats. By milling that much off the head surface, I was always afraid of blowing head gaskets or worse. 340 pistons are above block at 10.5 to 1. Those heads do look sweet.