This 1960 Buick Invicta convertible still carries its original 401 cubic-inch Nailhead V8, a genuine 325-horsepower engine Buick built for buyers who wanted real performance without admitting they wanted a hot rod. The nickname that followed the Invicta around, “the banker’s hot rod,” captures exactly the contradiction between its respectable badge and what was actually happening under the hood. Read on to find out what made this quietly powerful Buick tick.