I think if your plan is to scan an engine block and produce something sensible it might be a long shot. the Fule3D says it scans to about 0.35mm which is OK but again that is going to depend on the size of the object your scanning. The accuracy is going to also be dependent upon your scanning technique.

If you want to produce a production level 3D model using 3D printing you are going to have 2 sources of error, 1. the scanning process and subsequent model creation 2. the 3D printer. My guess is that the 3D printing is going to result in quite a lot of error depending upon your 3D printer. The scanning is also going to produce a lot of error, or rather low resolution. If you want to 3D print an engine block I would suggest creating the model from scratch in a 3D modelling/CAD suite (e.g. Cubify Design ). The 3D scanner may help you capture the essential elements but you would need to be very precise with your post-processing.

What are you trying to do exactly?