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This particular Chevelle never left the nest so to speak. From the day it was built, this '70 ragtop has been owned by General Motors and used as a test mule by GM Performance Parts for testing and development of its ever-expanding line of crate engines and accessories. When it was featured in the October '06 issue of Super Chevy, it hosted the first ZZ572 crate engine in 620-horse form. Other crate engines this particular Chevelle tested before production were the 502, the Ramjet ZL1, Ramjet 350, and the ubiquitous ZZ4 350, which some consider the catalyst for starting the mail-order motor craze that is still popular today.