72 Pontiac Firebird Trans Am FacebookTweetPin 72 Pontiac Firebird Trans Am. These muscle cars were built with a variety of different engine sizes. FacebookTweetPin Related 1967 Mustang Fastback Muscle Car 1967 Ford Mustang GT Fastback 1967 Plymouth Belvedere GTX 426 Hemi Convertible 1966 Ford Mustang Fastback K-Code The 1965 Ford Mustang “Vendetta” Orange Krush – Chevy Camaro SS