HOW TO FILL A DRY COOLING SYSTEM WITH NO AIR LOCKS

George Jets said
Drill an 1/8" hole in the thermostat, this lets the trapped air out of the block and heads.

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Make sure that you get a full 4 gallons of coolant into the engine, then you know it's full.

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This right here ^^^^^^, but really what Bewy said. The factory never worried about it. If you're gonna lose sleep over it, run a thermostat with a bleed. All HP high flow thermostats have them anyway, which is what you should already be running.