Restarts do require a start-up procedure that is different from the "cold" start-up procedure - somewhat related to "traditional" fuel-line/fuel-pump vapor lock, but easily avoidable via a different start-up procedure.
I have experienced vapor lock with some old engines, but never on a 216/235/261 stovebolt engine (in VA in the hot summer, at sea level and up to 1400 feet).
