On a hot day in July, Bobby Isaac cools off under the back of Richard Petty's #43 at the Firecracker 400, Daytona . Check out the aerodynamic sheetmetal work on the bottom of the car. Also, Isaac's car to the left is one of the two Chrysler experimental 2 x 2 chassis. This car later became the #71 Daytona mule at the Chrysler Proving Grounds, and is now the #88 car at the Talladega Museum.
The 2 x 2 nomenclature refers to inches and to the way the body was positioned on the chassis. Since the body was dropped 2 inches in front, they needed to make a special recessed intake for the car, so the hood would close. NASCAR figured out something was up, and made Chrysler raise the cars. In the revised configuration, they did not run well in the race. Chrysler was told not to bring those cars back. Chrysler spent a lot of effort on this project, for naught. Isaac's car is also the car wearing #88 at the Talladega Museum. Petty's car, however was not one of the 2 x 2 cars, but they had their own massaging tricks they had performed.