Yeah heaps helpful. I've been looking into and reading about this for months, if I knew the answers I wouldn't have bothered asking...
Where exactly in the rb30 guide does it state how/why to modify the water gallery, or why the rb25de head doesnt require an oil feed? Or if it does, how it is done?
I apologise if I have missed something obvious, but I am only aware of the mods required to the VCT on the det head.