I recently saw some footage of early Trans Am races and sure enough, there were 1st gen Firebirds along with the Camaros, Mustangs, etc. I thought Trans Am was limited to 5 litre engines. What displacement engines were the Firebirds running in those races? Does anyone know? Although a great engine, I don't think it was the OHC 6; one of the cars had a 400 hood. Thanks.