Time spread in Winters cast heads?

[camaro cat]

I am asking for opinions on how much more of a time spread should be expected for 842 L89 heads cast by the Winters foundary compared to 840 L78 heads cast by Tonawanda (sp)to then be installed on blocks cast the same day. With the much lower volume needed for production of L89 cars, surely Winters wasn't casting these heads every day and would have had short casting runs to keep ahead of Chevy. Or were they a small enough operation that daily production was what they did? I realize they were casting aluminum intakes among other things at the same time and I would guess at the same facility.