Roadrunner lines were already highly successful and Superbird came as a modification to that. Surely this made The Plymouth Hemi Super Bird, one of the unbelievable vintage cars of all ages. The purpose of the new design was to convert it into a race car. The Superbird was holding a 426 cubic inch Hemi engine and a plenty of high performing MOPAR parts. Superbirds came on the market in the year 1970 with a total production of 135 units.