The 12 Hours of Sebring, The Coca-Cola Classic, was the third round of the 1983 IMSA GT Championship and was held at the Sebring International Raceway, on March 19, 1983.[1] Victory overall went to the No. 9 Personalized Autohaus Porsche 934 driven by Wayne Baker, Jim Mullen, and Kees Nierop.[1][2][3]