LS1 water pump question
I like to put a small smear of silicone sealant - like Black Magic - on the gaskets during the install. It helps to hold the gasket in place, and lasts just about forever. Not too difficult to remove later, if need be.
It sounds like the mechanic was giving you advice for an old school small block.
Many people have used RTV only to discover later that it squeezed into the port. Just a coating of Permatex High Tack will do fine. It's also a better goop for sealing the bolt threads as it'll stay and seal forever. Anti-seize is a lubricant and can wash away over time and exposure to heat cycles and coolant.
Now, about the bolts. They do pass into a coolant passage and are exposed to coolant.
You want a SEALANT on the threads, nothing with any type of a lubricant including, moly, anti-seize or Teflon in paste or tape form.
The same Permatex High Tack is amazing on threads exposed to coolant, it'll still be on the threads after 100,000 miles.
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