There was a time when IMSA’s rules for the original GTP fit on a sheet of paper—a chart of weight versus engine displacement that sanctioning body founder John Bishop presented in 1985.

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Nasr and Tandy won the Rolex 24 at Daytona in January and the 12 Hours of Sebring in March and lead the IMSA GTP standings with 1,140 points. Fellow Porsche Penske drivers Mathieu Jaminet and ...