What are these intake holes for?

jonn6464 said
Great, thank you very much.

Just wondering, would #7 be an option for the temp sensor? I'm talking about the sensor that sends a reading to the dash gauge.
Is that what you are saying in your last sentence?

I would not use 7. In my opinion, you want the water close to leaving the engine for the sender. any of the "up front" ports 1, 2, or 3.