Interesting, the 5 pics I have of the aborted B"W2" version has no visible markings or callouts, & I'm sure Mullin didn't cast them. It's unclear & not specified who actually designed them, but the text stated they "never made it past the flowbench", which is why I'd like to see a real functioning set tested(not likely ever). I think with just the ports raised & the correct valve sizes they were probably a lot better than given credit at the time.