in that they did not keep the stock rear doors—as is typical in most limos. The back doors were welded shut and the Ambassadors were lengthened by inserting a section just behind the original B-pillar that had an entirely new central door in this center making a large opening for entry and egress. steel "I-beams" bridge the expanse created by the stretch. Power comes from the "AMX" V8 engine backed with the BorgWarner automatic transmission and a "Twin-Grip" limited-slip differential with 3.15 gears. 1970 For the 1970 model year, the rear half of Ambassador hardtop coupes and sedans were treated to an overhaul that was also shared by the intermediate 1970 AMC Rebel. On hardtop coupes, this restyling resulted in a sloping roofline that saw upswept reverse-angle quarter windows. The beltline kicked up at the point the hardtop's rear windows swept upward, and tapered back to the fender end, meeting a new loop-type rear bumper. On sedans, the roofline featured slimmer C-pillar, squared-off rear door windows, and it met a beltline that kicked up beneath the trailing edge of each rear door window. The beltline tapered back to the same rear fascia as on the two-door hardtops. This rear fascia contained a new ribbed taillight lens that stretched wall-to-wall and included twin square white reverse light lenses in its center. Station wagons received no change to their rooflines, doors, and rear fascias. However, all Ambassadors received a new extruded aluminum grille at the front, featuring several widely spaced bright horizontal bars with one wide, body-colored horizontal grille bar extending to each headlight cluster. New "turbine" themed wheel covers were introduced and would remain through 1974. The V8 was replaced for 1970 by a new V8 engine. This at 4400 rpm and of torque at 2800 rpm was the standard engine on all DPL and SST models. The V8 was also supplanted by a engine available in either 2-barrel, regular gasoline, or high-output, 4-barrel, premium fuel versions. The 4-barrel "AMX" V8 engine was optional, producing at 3200 rpm and of torque at 3200 rpm. 1971 Following the previous year's redesign, the 1971 Ambassadors received minor changes and improvements. The marketing tagline for the year was the underdog asking, "If you had to compete with GM, Ford and Chrysler, what would you do?" — that was answered by AMC including more features, advantages, and benefits for buyers of its cars compared to