Good candidate engines for an educational rebuild
Fairly new to the group, reading a lot of stuff. I work on my vehicles, and my son, who will be turning 15 in a couple of months, (and who loves all things automotive) has asked to have an engine he can tear down and rebuild as a little project.
He is comfortable doing maintenance and basic repairs on cars (oil changes, spark plugs, etc.) and I'm comfortable with him doing it, too. So my question here is, if I wanted to get him an engine to tear down and rebuild, just for a project on its own, what would you recommend? Obviously something relatively simple, relatively small. Just so he can get some time turning wrenches. We've got most, if not all, the tools we'd need already. Any recommendations would be great. Thanks!