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To make up for the junkyard teaser, here's a shot of a cast-iron W43 four-valve 455 cylinder head taken from the 1971 Petersen Complete Book of Engines. Karl Ludvigsen's story says a complete W43 was actually installed in a car but was never tested. GM's antiperformance climate and looming federal emissions regulations killed the W43 and its DOHC brother-the OW43 in 1971. But you can bet Olds took a second look at the engineering lessons when it developed the Quad 4 a decade later.