Last summer my daughter drove our 2001 Camry 50 miles with a stuck thermostat. with poor judgement and bad advice, I pulled the head, had it planed, and re-assembled. yes, it was still blowing exhaust into the cooling system. I finally found some time and installed a reman engine in the car over the last week. It was almost easier to pull the engine than it was to pull the cylinder head. anyway, the car lives! only two problems: one of the core plugs, aka freeze plugs; was leaking. easy to fix. and now the car has a vibration/buzzing noise in either the engine or first half of the transmission. not sure what the cause is. did the remanufacturer fail to balance the rotating assembly? is there something askew with the balance shafts?? The remanufacturer used top quality parts: aisin/Toyota water pump and oil pump, OEM timing belt. not sure on the pistons, bearings, etc.