I'm sorry if it's off the topic, but I'm curious about one thing.
If I remember correctly, the SOHC and DOHC KA heads are basically interchangeable. The KA24DE DOHC head is somewhat more complicated than the KA24E head, as it has one more cam, four more valves, and many more moving parts. If so, then wouldn't a SOHC head based on the KA24E unit be simplier to build and modify?
I remember 1_fast_z's diagram showing the differences in flow between standard and modified L and KA SOHC/DOHC heads, and even though the SOHC head didn't perform as well as the DOHC head (especially ported), it was still much better than the L-gata heads. Apart from not having two overhead cams, the SOHC head should be good enough for performance applications. So, would it be worth it to cast such head instead of a DOHC head?
Then again, when I think of it, the cost of casting a SOHC head would be just as big as when going the DOHC way... It's just the components that would be cheaper.
Any thoughts?