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Did the motor overheat? White smoke could be coolant. I am also concerned about the appearance of your oil pan gasket material. It looks like it is extruding out where the pan meets the block on the back half of the passenger side of the motor. I would be concerned about an oil leak here. Obviously if your motor seriously overheated there could be other significant issues, liked warped block and cylinder heads. Further investigation is needed on your part. I would start with a thorough evaluation of your cooling system to make sure nothing is leaking (the hissing sound you heard is typical of a leaking cooling system as steam escapes. You can get a cooling system pressurizer at somewhere like Harbor Freight to test the system while it is cold.
 
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