While he was spectating at the 1972 12 Hours of Sebring, Stewart attempted to organise a boycott of the Spa 1000 km race that year, a move that was not respected by many of the drivers, because Spa was still popular with racing drivers outside of Formula One.
Mentres estaba de espectador nas 12 Horas de Sebring de 1972, Stewart tratou de organizar un boicot a carreira dos 1000 km de Spa dese ano, unha medida que non foi respaldada por moitos dos pilotos, porque Spa aínda era popular para os pilotos de carreiras fóra da Fórmula Un.