I bought a FC convertible in March. Aside from a FPD leak that I fixed with a Marren FPD, the engine runs fine. The car has 350000kms (~218000 miles). I have no history on the engine. How can I tell if its been replaced or even rebuilt? I can't seem to find a serial number.

 

there really is no way to tell if the enige has been replaced or not. i suggest you doing a compression test to see where your motor stands.