At introduction, the new engine had a 4.30 in (109 mm) bore and a 4.06 in (103 mm) stroke for a displacement of 472 cu in (7.73 L). "Extensively redesigned" to ease maintenance, it used only 90% as many parts and 75% as many gasketed joints as before.[2] It delivered 375 hp (280 kW) at 4400 rpm and a massive 525 lbf·ft (712 N·m) torque at just 3000 rpm. The new engine was about 80 lb (36 kg) heavier than its predecessor. It was used through 1974. It was designed with potential for a 500-cubic inch displacement.
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