Did Clifford and Davey Allison die within a year of each other?

No, Clifford Allison and Davey Allison did not die within a year of each other. Clifford Allison, the son of racing driver Donnie Allison, died in a crash on October 14, 1992. Davey Allison, a well-known NASCAR driver, died in a helicopter crash on July 13, 1993, nearly nine months later.