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964 engine, transmission and differential rebuild

Engine

Vehicle Information: Year: 1990; Body Type: Coupe; Engine (type, size, modifications): 993 cams, port & polished head; Total Mileage: 116,000;

The top-end was rebuilt and modified at 80K.When and how will I know when the engine will require a complete overhaul? The service recordsindicate that the car was well cared for. I'm the second owner. I am most concerned about the bottom end...how long do they "usually" last?Ditto with the transmission and front differential on my C4.I thank you in advance for your help.

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