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If the engine number has an “AT” as part of the serial number, then it is a factory replacement engine. That also means that it has the larger non-serviceable IMS bearing. That is a positive. The larger bearings, while not being replaceable without tearing the motor apart, have a very low failure rate, particularly when the car is just driven normally and not tracked vigorously.
If the odometer shows 51,000 miles, that means fewer than those miles are currently on the engine.
PCNA should be able to tell you where the car was originally sold from. I would research the dealer for warranty replacement engine paperwork.
If everything else look good on the car, I think you should go for it.
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Tony G
10 Porsches come & gone!
1962 Morgan Plus 4 
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