actually it could be a little smaller opening since most manufacturers over design for the masses...
but you thought process is very correct Varn.
Let me throw this uot.
I travelled a great deal on a ranch road in my Infiniti Q45. The dust built up in the radiator. Even though I was my car religously, the fine dustg built up and caused overheating....even with two extra electric fans.
When I replaced the radiator......about 20 oz of dirt fell uot..........just sharing my experience.
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