Plenty of talented craftspeople have built miniaturized engines, including painstaking duplicates of famous powerplants like the small-block Chevy or Ford flathead V8. These things start and run like their full-size counterparts yet can fit in a shoebox. Unfortunately, as cool as these labor-intensive projects are, not many of them are available for sale. But one company, PM Research, offers a range of different engines, including a quarter-scale model of a five-horsepower Red Wing Motor, complete with a 1.25-inch bore and a 2-inch stroke. It runs on gasoline and is water cooled. One of these units, fully assembled and ready to run, goes for about $2,950. If you can do the machining work yourself, you can grab a do-it-yourself kit for a mere $550. How cool is that? This is one gift almost nobody is going to have.