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GM originally designed the aluminum 427 to compete in the Can-Am road racing series during the mid ’60s. According to some estimates, only 90 copies of the motor were ever built for production cars, 69 of which ended up in Camaros. A few years back, Chevrolet Performance brought back the aluminum Rat as a limited-edition crate motor. A similar unit resides under the hood of PHR’s own Project X.