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If you're as excited as we are by the 2012 Chevy Camaro ZL1, it might be wise to understand the historical significance of those three letters at the end of Chevy's retrofied muscle car. Way back in 1969 – a year some consider to be the apogee of Camaro history – the automaker built just 69 ZL1s, each powered by an aluminum-block 427-cubic-inch V8 that was otherwise unavailable in the Camaro and built specifically for drag racing.