[mwebb]

those engines do not just up and pop head gaskets at 40k
unless
they were overheated

in fact those engine rarely pop head gaskets for any reason
they are very robust - so
there is a surprise lurking , that you have not found , look close around the water jackets of the cyl head , when zeros add the wrong coolant , or the pressure cap fails
they get cavitation erosion which eats into the aluminum head and under cuts the head gasket -

that would be your best failure scenario , otherwise
it was overheated when the plastic impeller broke off of the water pump shaft and the driver did not understand what was happening

Originally Posted by Christ

No damage to the head at all, still have that, too. Deck is straight on the block, no other damage. It's actually really clean, still has the factory black paint on the block and no oil staining inside.