Although the modernized 390 series engine was compact and light for its displacement and output, represented the limit of the original architecture's expansion, and it had been surpassed by Chrysler's 440 and Lincoln's 462 and 460. Cadillac went bigger - with provision for even more expansion. At introduction, the new engine had a bore and stroke for a displacement of . "Extensively redesigned" to ease maintenance, it used 10% fewer parts and 25% fewer gasketed joints as before. It delivered at 4400 rpm and a massive torque at just 3000 rpm. The new engine was about heavier than its predecessor. It was used through 1974. It was designed with potential for a displacement. 500 For 1970 Cadillac fitted a crankshaft with a stroke, increasing total displacement on the engine to . At its introduction it was rated at , SAE gross, and of torque. For 1971 compression was reduced from 10.0:1 to 8.5:1, the lowered compression ratio dropped the 500's gross output from to , or in the new SAE net ratings. By 1976, its final year, it had fallen to . However, a new Bendix electronic fuel injection system was offered as an option, and it increased power output to . The 500 was exclusive to the Eldorado until 1975 where the powerplant was standard in all Cadillacs except for the Seville, which was powered by a fuel-injected Oldsmobile 350. 425 series Starting in the mid to late 1970s Cadillac expanded its product range offering more mid sized vehicles, i.e. sedans and coupes. While initially the Cadillac Seville for example, which was positioned in the mid sized segment used a variant of Oldsmobile based architecture V8, Cadillac also began work on its own proprietary engines. In 1977 Cadillac introduced a new V8, based on the architecture of the 472, but with a smaller, bore and the same stroke. The new engine was also lighter. The 425 was offered in L33 form, with a four-barrel carburetor, producing at 4000 rpm and of torque at 2000 rpm, and L35 with electronic multi-port fuel injection for and of torque, but peaked at 2400 rpm. The 425 was used through 1979 on all Cadillacs except the Seville and 1979 Eldorados. 368 In 1980 the 425 was replaced with the L61, which was the same basic 472 family engine de-bored to but retaining the 472 and 425 engines' stroke for a total displacement of