I have built a custom cylinder head for an inline 6 cylinder datsun engine, by cutting and bolting together three pairs of heads, its pretty simple. Your 15-20k is about half of what casting and mold cost would be, trust me Ive looked into it. We are actually milling a billet head for our straight eight, 8 intake ports and 8 exhuast ports, but not crossflow, and not OHC. You might wanna look at a studson motor, as they are a ohc straight eight.
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