Chevrolet Combined Two Different Engines to Beat a Racing Rule in 1969 — This Camaro Z/28 Still Has the Receipts by Jack Harmon A 1969 Camaro Z/28 resurfaces in California with its original dealer build sheet intact after 57 years and 88,000 miles — proof of a car Chevrolet never built for comfort. Here’s the racing loophole that created its engine in the first place.