Re: Coolant flow
When filling the cooling system, you need to fill the radiator to about 1" from top, start the car, let it come up to temperature. When the thermostat opens, you might get a over flow with the escaping air (normal), then just add coolant until you're back to about 1" from filler neck.
Sometimes air will get trapped causing hot spots/overheating issues. Raising the front of the car helps most of the time to "burp" the air.
68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53