Regardless of whether we're looking at the biggest-capacity V8 engines or the smallest-displacement V12s, or anything in between, engines are a core part of what drives a gearhead to be a gearhead.

One of the smallest inline six-cylinder engines ever made sat under the hood of an MG, which makes one of the best classic cars under $10,000. It measured 1,086cc in displacement, equal to 66.27 cubic ...