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Hi, I recently picked up a 2003 lexus gx470 off of my mother. it has the 4.7L tundra engine in it. She overheated it bad. melted the coolant overflow tank. anyways i did a compression test and it has perfect compression on drivers side cylinders (170psi) however, passenger side came out at (0psi) in 2, 4, and 6, and 30 psi in cylinder 8. any ideas? head gasket? or something a little more complex then that
 

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Head gasket is blown for sure if it got that hot. Warped head and will need to deck the block for straightness. Water pump might have seized up and caused the overheating.
 
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