One might very well spot, sitting in a remote corner these days, a not-quite-so-familiar large spark-ignited (LSI) engine — in position for various engine power needs. Based on the architecture of a liquid-cooled automotive engine, it might be a little mysterious, its actual origins not always clear.
But it would have come from a solid family of a matching block, cylinder head and all the requisite internal components. Those components include crankshaft and pistons, with connecting rods holding things together and passing power along to the previously mentioned crankshaft. These are all carefully designed and put in place to work together harmoniously for many thousands of hours, just as such basic automotive powertrain packages would have been doing for many thousands of miles.