Twin races set for the second generation of American muscle car power that defined Trans Am racing from the 1970s through 1991.

Lyn St. James. Willy T. Ribbs. Mark Donohue and Roger Penske -- all three have made major contributions to the Indianapolis 500. And the Trans Am Series Presented by Pirelli helped launch them on the road to Indy.How St. James got up to speedLyn St. James (pictured above at Detroit...