Virtually all New Look buses were powered by Detroit Diesel Series 71 two-cycle diesel engines. The original engine was the 6V71 (V6). GM buses used a unique "Angle-drive" configuration with a transverse mounted engine. The transmission angled off at a 45-or-so degree angle to connect to the rear axle. The engines were canted backwards for maintenance access; in fact, the only parts not accessible from outside the bus were the right-hand exhaust manifold and the starter. The entire engine-transmission-radiator assembly was mounted on a cradle that could be quickly removed and replaced, allowing the bus to return to service with minimal delay when the powertrain required major maintenance. Originally, all New Looks were powered by the 6V-71. GM resisted V8 power but eventually gave in to pressure from customers.