Fill the coolant
Start the car
Rev engine at throttle plate
Watch coolant bottle while doing this
See if coolant goes away and then comes back
If this happens, you have a head gasket leak that is allowing combustion gasses in the cooling system. The second best head gasket leak to get, the first would be no head gasket leak

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2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
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