Whut you call a expansion tank (reserve tank) is a Degas tank.
BACKGROUND OF THE INVENTION
In certain automobiles manufactured by various auto companies, the cooling system used for the engine is of the so called "closed" type wherein a plastic degas tank is provided that is physically separated from the radiator and is closed by a pressure cap of a type normally located on the radiator. The degas tank is operated under internal pressure of about 15 PSI gage and is connected to the engine and the radiator so that the coolant circulates through the degas tank. One purpose for the degas tank is to allow entrained air and gasses in the coolant to be separated from the coolant as the coolant flows through the degas tank.
Keep a check on it, it may not be a problem then it may be. I would not completely fill it worst case it will belch some coolant out. If it has the original hose I would order up new ones from GM if for nothing more than to replace all the plastic parts in the hoses THAT ARE GONNA BREAK!!!!... One overlooked problem could be the hose that goes from the top engine side tank to the radiator could be stopped up, are stopped up on the nipple at the tank are radiator. The hose is preformed 1/2" heater hose retailing for about $100 from GM... Its the only hose I make up from a roll of 1/2" heater hose I mark it and just swap it out every couple of years EZ as pie... The rest I pay the ransom fee :(...
If it has a leak there is no reason it can not be found with a pressure test... The issue with those castech cylinder heads you do not have to remove a valve cover to confirm a issue just look at the oil filter it will tell the story... Dirty filter in the pix leaking castech heads at 3K miles...
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