Thanks to all for the feedback.
5715 will be powered by an all aluminum 400 CI Clevor engine so the Cleveland specific cooling parts, specifically the thermostat, are different. The Clevor will have considerably more output than the stock engine so I want to optimize the cooling system. A remote thermostat will be used. My understanding of an automotive cooling system’s dynamics parallel George’s that’s why the larger coolant tubes. I'm planning on using 1.5" tube to the radiator and 1.75" return. A high flow water pump will be used. I plan on using the car as much as possible so idle and low speed cooling (flow) are important to me. Am occasional track day is likely (system thermal capacity).
George, Do you mind sharing the metal punch size and grommet part number or source? Thanks!
Mike
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