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I have checked all my fluids every 2-3 weeks since getting my 1985 Vette, the past two times I have checked, my radiator has been a 1/2 gallon low. There are no puddles in the garage, so is this almost for sure a head gasket, or is there something else it could be?
Do have alum. heads? Mine was a head gasket, left bank on the back side. Slow enough to not puddle but did leave stains down the back side of block etc.
Check your water pump. There is a weep hole in the bottom that serves as venting. When mine was losing fluid it was coming out the weep hole in little amounts until it became lots of fluid. New water pump time.