Showboat is a four-engined four-wheel-drive exhibition slingshot dragster, built by "TV Tommy" Ivo in the 1960s.
Showboat featured four Buick nailhead V8s, linked together; two drove the rear wheels, two the front. [1]
While Ivo never liked the name, Showboat proved one of the most popular models of his cars. [2]
Showboat was Hot Rod's December 1961 cover car. [3]