Sorry if this has been posted before I couldn't find it. Anyways, I was wondering if there was any way you could tell the true mileage of a motor that was swapped in to the car. I know you can check to see if it is mechanically sound, and that is probably more important. But if you have a shop put in a motor do they write down you current car mileage, so you could tell or anything like that?

unless the shop that installed the motor knew the mileage on it and wrote it down somewhere, there's no way to tell.