What a loss to motorsports Mark Donohue’s death at age 38 was: He gave team owner Roger Penske his first Indianapolis 500 win, Penske’s first NASCAR win, and he drove for Penske in Formula 1.

To improve his odds of winning, Penske decided to send a two-car Sunoco Camaro team to Sebring for the 12 Hour endurance race. Despite being declared illegal the previous year, The Lightweight was ...