Automotive engines in small, single-prop aircraft aren't anything new. Aviation enthusiast and small aircraft owners have been swapping LS V8s into planes for years. Some of them are DIY projects, ...

There is a range of common adjectives that come to mind when we think of V12 engines. "Smooth" is one, evidenced by engines like the V12 that powers the ultra-luxe Rolls-Royce Cullinan Series II.

Small gas engines built before the 1990s used cast-iron cylinder sleeves and thicker piston rings that resist wear far longer than modern aluminum-bore designs. Brands like Briggs & Stratton, Kohler K ...