Actually, in 1957 the gold V on the hood and trunk signifies it is a Belair model. The 150 and 210 models had a silver V on hood and trunk. It has nothing to do with engine type. BTW in 1957 power pack heads were on all 283 engines with the 4 barrel carb, dual quad and fuel injected engines. Power pack heads were not available for the 180 hp 283 engines.1957 Chev Bel Air 4 door sedan. It has the gold colored V (for V8) on the hood and the gold color indicates power pack cylinder heads (I'm pretty sure0. Nice car!