this is a really interesting question. what does "trust your engine builder" mean?

i assume that he is being paid to build an engine, and also to have the experience and quality of work to not do these types of mistakes.

i know many people have everything machined and then assemble the engine themselves. that is what i'm doing, and i have to trust my machinist, as i don't have the tools required to check the cylinder dimensions for example.

but do you pay a builder to build an engine, then take it home and tear it apart and check everything, and then reassemble it?

i'm just curious about this as i'm not sure what this question really means. when i have plumbing work done, i want to see the shower valve before we button up the wall, but i don't un solder all the joints and take it apart to make sure it was done correctly, (not a perfect analogy, but you get the picture).