Kaase P-38 heads ARE Windsor heads with Cleveland valve angles, 2.10" intake valve, 1.6 exhaust valve, shallow (like a Cleveland) high swirl combustion chamber. They bolt directly to Windsor blocks, have Windsor cooling passages, and mate with Windsor intake manifolds & headers. The slightly smaller intake valve allows for the combustion chamber to be sized to actually fit within a 4.00" bore. They flow very well for having such low port heights (standard Windsor port heights).
They're the only Windsor heads like that, which I'm aware of.
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