Still overheating after head is skimmed

When the head gasket is blown, always fit a new replacement gasket from the manufacturer, (after the head has been checked/skimmed to get it flat again as they warp).
Also new head bolts are required.

Could be all sorts of things but check why you only have 125PSI when expected is 175PSI.
Cracked/warped head is usual unless you have had it skimmed.
Could be ignition issues, could be a valve issue ...

warped block or cracked head

Hi, did you recently skimmed the cyl-head? if so, then cyl-head is skimmed till last capacity, so you need to get the thicker cyl-head gskt. If not skimmed, remove cyl-head and skim it. it might be corroded or wapped.

You have blown the head gasket. Also, you may have warped the head if it's aluminum which will happen due to ignoring the issue of overheating...which eventually caused the "blown head gasket". So, it sounds like you have 2 issues to resolve. 1) Why was it tending to overheat? Stuck thermostat, water pump issue or??? 2) Repairing the cylinder head or replacing it if warped badly, if your lucky it's just a blown head gasket. Allowing a overheating vehicle to be in service without solving that the overheating can lead to MANY other expensive problems.

how could they check for head warpage if they didnt pull the head and put it on a plate? Im calling poor diagnosis.

NO....unfortunally if a cam is bad that means needs a head, also they may be warped, sending to be repair will be too expensive, plus the cost of a short block, your best bet is to found a good used engine and swap it. good luck

You won't know if head is warped until you pull it off and have machine shop check it. Sometimes they just leak and survive, other times if it overheated badly then you might have warped head and then it will need machining.

Its the head gasket.Get it changed and have the head checked for cracks and get the head skimmed has it may have warped.All alloy heads warp when being removed so have it skimmed before replacing.

Unfortunately there's no way to tell until you pull the head off. if the gasket has failed you'll nee to get the head checked for cracks and flatness anyway (and possibly skimmed flat) and if the head comes off you have to replace the gasket anyway.

With overheating, the most likely situation is that the head has warped slightly causing the gasket to fail. If so, the head gets skimmed flat before fitting a new gasket. Note that on many modern engines it's vital to use new head bolts upon reassembly; your Oldsmobile dealer can tell you if this applies to your model.