Expanding on Leon's point, first we(Chrysler) had the polysphere head and now we have the Predator, both are canted/splayed valve heads. So, if you want to be technical the Predator IS a Chrysler design! And the Polysphere line of engines were some 10 years before the Chevy 396. OK, maybe Chevy was the first to race the design and I suppose you could argue that point if you wanted to. But, I think you will have to admit, Chevy does not have sole ownership of the splayed/canted valve factory head.