The G-engine gained an enviable reputation for reliability and nearly unstoppable durability. The basic engine design incorporates much heavy-duty engineering, in part because the engine was designed from the start to be made of either iron or aluminum: The block is of a deep-skirt design, with the crankshaft axis well above the oil pan rails for structural rigidity. Although only four main bearings are used, they are of the same dimensions as those in the Hemi. Very efficient cooling and lubrication systems, a favorable rod ratio, and an extremely strong forged steel crankshaft (on engines made through mid-1976) all contributed to the engine's apparent indestructibility. In addition, the G-engine also provided better performance than most of its competition in the 1960s and 1970s. By the 1980s, the G-engine had been effectively strangled by continual addition of increasingly-restrictive exhaust emission control devices, without upgrades to the combustion chamber design, piston displacement or induction system, all of which were by that time quite antiquated. G-engine use in passenger cars was rapidly phased out in the early 1980s as Chrysler Corporation shifted to front wheel drive architecture.