I have a rare euro 4 port head for sale if anyone is interested PM me a message
as Im now focused on a motorike headed ca20e build will freight depo to depo
These are the all out performance CA head that never came to Australia and similar to a big 4age setup or 4g63 from nissan or a Nissan Cosworth / Cossie head you will notice ports are not as wide as the 8 port so if you open up the 8 port it will be too wide for ideal flow as the 4 ports are already huge.
4 port height is about 45mm and width about 56mm.
Also have inlet flange area was going to make custom inlet manifold.

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  4 port vs 8 port.jpg (164.62 KB)