Three students and instructor Lloyd E. Olson (left) are in the Auto Diesel Tune Up shop working on a car. The car's trunk is open to reveal the engine, and chains are attached to the back of the car. The car is Chevrolet Corvair, the only American-designed, mass-produced passenger car with a rear-mounted engine. One student is sitting in the driver's seat with the door open. Another student is operating a Sun 500 Scope Motor Tester. The instructor is watching