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It may pass a compression test but fail after it is hot, it might not even fail until it is subjected to the highest sustained load like climbing a 2 mile 7% grade.
It might show up on a leak downtest but it could (as I said already) not be totally proveable until you have the head gasket in your hand and if its not the head gasket (which i think is 90% sure head gasket) its something cracked in the block or head.
I would just see if I could find another engine before I spent your quoted price on a gasket replacement only to find out then something is cracked with a lot more cash down the toilet.
But then you run the risk of another progression of problems.
My (you pay me as a business) advice would be a teardown to see if the head gasket passed a visaul inspection and then go from there. Now you understand why xyz advised you to run the cooling fans constantly. Cooling fans are not designed for a 100% duty cycle and draw a huge amount of current which cost you mileage.
It may be your best bet for now or your only option (considering you do not have the money) but it is definitely not a repair any professional would recommend or perform in the present legal climate which applies to potential defendants in lawsuits.
For you, on your own car, you don't have to lookat it the same way I have to, even just giving you advice.
regards
mech
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