The P538 or P538S was a rear-engined race car launched in late 1965 or early 1966 by Scuderia Bizzarrini of Livorno, Italy. At least two P538s were built with the Chevrolet Corvette's 327-cu.in. V8 engines and two more with 4.0 and 3.5-litre Lamborghini V12 engines. Five-speed manual transaxles were used, with gearing specific to the race for which each car was constructed. Braking was via inboard four wheel disc brakes, with a fully independent suspension. The body was made of fiberglass over a tubular steel chassis.
