The 1970 Chevy Impala Convertible looked pretty similar to the 1969 model, though certain trims were lacking power under the hood. And the 427 engine was an outdated option in comparison to the “SS” option.
The other engines included a 155-horsepower 250 cid six, which was offered specifically on the four- door sedan and sport coupe in the Impala range as the only V8s were offered on the Impala sport sedan (four-door hardtop), Custom Coupe (which shared the squared-off roofline with the flagship Caprice coupe) and Convertible, along with the Impala-based Kingswood station wagon. The standard V8 was a 250-horsepower 350 which replaced the 327 of previous years. Optional V8s included a 265-horsepower 400 cid and 300-horsepower 350 cid.
The standardized transmission was a three-speed manual with a column shift and optional transmissions including the two-speed Power glide, and the three-speed Turbo Hydra-matic. The four-speed manual transmission was dropped from the option along with the SS package.