ordered with the police package which used RPO 9C1 (which became the default SEO (service option) code for subsequent Chevrolet PPV packages). Third generation (Chevelle Malibu, 1973) The Chevelle was redesigned for the 1973 model year. Models included the base Deluxe, mid-range Malibu & Malibu SS and the top-line Laguna. For 1974, the Deluxe was dropped, and the Malibu became the entry-level Chevelle. The Laguna trim package was replaced with the Malibu Classic which used a stacked arrangement of four rectangular headlights and made its way to the dealers in the 1976 model year, offering the Chevrolet built inline six 250 CID as the base engine. The Laguna S-3 model was introduced to replace the SS, and continued through 1976. Fourth generation (1978) For the 1978 model year, the Malibu name, which had been the bestselling badge in the lineup, replaced the Chevelle name. This was Chevrolet's second downsized nameplate, following the lead of the 1977 Chevrolet Caprice and Impala. The new, more efficient platform was over a foot shorter and had shed compared to previous versions, yet offered increased trunk space, leg room, and head room. Only two trim levels were offered - Malibu and Malibu Classic. The Malibu Classic Landau series had a two-tone paint job on the upper and lower body sections, and a vinyl top. This generation introduced the Chevrolet 90° V6 family of engines, with the 200 CID (3.3 L) V6 as the base engine for the all new 1978 Chevrolet Malibu, along with the 229 CID (3.8 L) V6 and the 305 CID (5.0 L) Chevy built V8 as options. The 200 and 229 engines were essentially a small block V-8, with one pair of cylinders lopped off. The front and rear bellhousing face were the same as the small V8. The 231 engine was a Buick product, and featured a front distributor. Three bodystyles were produced (station wagon, sedan, and coupe), and the design was also used as the basis for the El Camino pickup truck with its own chassis. The sedan initially had a conservative six-window notchback roofline. This was in contrast to the unusual fastback rooflines adopted by Oldsmobile and Buick divisions which would later revert to a more formal pillar style. To increase rear seat hip room (and encourage more orders for the high-profit air conditioner), the windows in the rear doors of four-door sedans were fixed, while the wagons