1960, only the Valiant could break the 20-second mark from 0-60 mph. None of the Big Three compacts offered a V8 until the second wave of such cars — the so-called "senior compacts" — arrived for 1961. To meet the challenge of those new cars head-on, for 1961 Studebaker created a new four-door sedan, the Cruiser, using the Econ-O-Miler taxicab body with an upgraded, more luxurious interior. The resulting car harked back to the long-wheelbase Studebaker Land Cruiser sedans of the late Forties and early Fifties. These cars can be distinguished from their lesser four-door counterparts by the 1959-60-style roofline and operational vent windows in the rear doors, while other sedans used one-piece glass in the rear doors. A new option, a canvas-covered folding sunroof dubbed the "Skytop" was introduced as an extra-cost feature for sedans and the two-door hardtop. A mild restyling, too, was carried out. Non-Cruiser sedans and the two-door hardtop received a squared-off roofline, and a new front end design gave the Lark a broader grille and the availability of quad headlamps (as standard equipment on Regal and Cruiser models, optional on Deluxes). Although the styling was modified, engineering enhancements were the big news for 1961, as the Larks received a performance boost. Studebaker advertised as "the compact with Performability," and this was abetted by the addition of the V8 from the Hawk family sports car as an option, although this was mainly for Larks intended for police pursuit packages. The bigger news, as far as the general public was concerned, involved the six-cylinder engine. Studebaker's engineers had long known that their little flathead mill, which dated in its basic form to 1939, was falling farther and farther behind the competition in both power and fuel economy. Lacking the budget to design a completely new engine, the engineering staff converted the 170 engine to overhead valves while retaining much of the basic design. The "new" six, which displaced the same 170 cu. in. as before, went from to , all without a loss in fuel economy. Indeed, most road testers of the day found the new engine to be easier on fuel than the flathead, and cars so equipped were able to shave nearly four seconds off the all-important 0-60 mph time. The redesigned six, known as the "Skybolt Six," was marketed by Studebaker extensively in 1961. Other engineering improvements that modernized the 1961 Larks included the