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In page Buick:

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The Buick V8 engine, nicknamed the Nailhead because of its relatively small intake and exhaust valves which resembled nails,[citation needed] became popular with hot-rodders in the 1950s and 1960s because the vertical attachment of the valve covers, in contrast to the angled attachment of other V8 engines, enabled the engine to fit into smaller spaces while maintaining easy access for maintenance.[citation needed]