The 1970 Plymouth Superbird was a modified version of the Road Runner. It was designed & developed for NASCAR racing, specifically to lure Richard Petty away from the Ford Racing Team & back to Plymouth for the 1970 season. Richard Petty did reasonably well against strong Ford opposition on the NASCAR tracks that year, winning eight races and placing well in many more. Superbirds had three engine options: the 426 Hemi V8 engine producing 425 hp , the 440 Super Commando Six Barrel with three two-barrel carburetors producing 390 hp or the 375 hp 440 Super Commando with a single 4-barrel carburetor. Only 135 models were fitted with the 426 Hemi making them very rare and desirable for car collectors. A Superbird today can command prices between $100,000 to $200,000 dollars at auction.