[Sledge]

Thanks for the replies. The radiator is already larger than the standard radiator, which is supposed to be more than adequate for a 351W. The radiator is fully shrouded and has a Big Mother F______ Spal fan.

A mechanical pump is dependent on rpm for coolant flow. So, low RPM operation would mean lower water flow than at cruise. Thus, more flow at low RPM, as when driving around town, would seem to be beneficial.