Ah yes. Thanks for this, as I was going off of some old memories in my head.
Originally Posted by nubcake
Steve, correction: there actually is an afterrun pump in both configurations. Just two different flow directions. "Early style" just ties into the "normal water feed", thus doesn't really aftercool much. The "later" (or hot weather?) style actually reverses the whole coolant flow after shutoff.
Pic shows the early style aftercooling configuration:
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