In 1977, Pontiac and other GM divisions downsized their full-sized cars in an effort to lighten weight and improve gas mileage. The Catalina continued as Pontiac's entry-level full-size automobile with a Buick-built 231 cubic-inch V6 now standard in sedans and coupes (Safari wagons came standard with V8 power) and optional V8s of 301 CID, 350 CID and 400 CID displacements, each Pontiac-built engines and offered in all states except California. The Pontiac 350 was offered in 1977, but replaced by Buick and Oldsmobile 350 V8s from 1978 to 1980; and the Pontiac 400, offered through 1978, was replaced by an Oldsmobile 403 V8 in 1979 only. An Oldsmobile-built 350 Diesel V8 was optional for 1980 and 1981, along with another cut-down Pontiac V8 of 265 CID.