thumb|Scarab roadster #16 (left-hand drive) at the 2005 Historic races at [[Mazda Raceway Laguna Seca|Laguna Seca Raceway]]
Scarab was an American sports car and open-wheel race car constructor featuring cars designed and built by Tom Barnes and Dick Troutman for Reventlow Automobiles Inc, owned by Lance Reventlow. The Chevrolet 283 CI V-8 engines were built by Traco Engineering (Jim Travers and Frank Coon, nicknamed "The Whiz Kids").
thumb|The Scarab badge
History
thumb|Two Scarab roadsters (#5 is right-hand drive) at the 2005 Historic races at [[Mazda Raceway Laguna Seca|Laguna Seca Raceway]]
Troutman and Barnes built sports cars for amateur road racing in the USA in the 1950s. Chuck Daigh drove the Scarab sports car to victory in the 1958 Riverside International Grand Prix, beating a field of international factory teams including famous race car driver Phil Hill and the Ferrari Team. They featured desmodromic valve gear similar in design to that found on the Mercedes F1 engine of the 1950s and were built and maintained by Travers and Coon. The engines were the shortcoming of the team as the desmodromic gear could not cope with the large amount of movement in the engine block and would consistently pull the valves too far closed resulting in valve failure.