Sure could be. They probably started pouring at least a couple months before a new release. There is a lot of fine tuning to get things right fora production run on a new part like that. It's a pretty complicated process. 273's and 318's had been around for a few years and had been tweaked already.
That could well be one explanation. And therein is the issue. Unless we can get hols of somebody that actually did that job, we'll probably never know.
