Engine
250 cu in (4.1 L) Chevrolet I6
350 cu in (5.7 L) Small-Block V8
400 cu in (6.6 L) Small-Block V8
454 cu in (7.4 L) Big-Block V8 

Transmission
3-speed manual (standard, 1971–73 on six-cylinder cars)
3-speed Turbo-Hydramatic auto. (optional 1971–73 on six-cylinder cars; standard on V-8 powered cars from mid-1971 on) 

Chevrolet Bel Air on Wikipedia

TECH SPECS WILL BE HERE SOON