The CART/Champ Car era started in 1984 and lasted until 1987, an era that saw Andrettis and Unsers trading wins seemingly the whole time. Bob Riha Jr//Getty Images Al Unser Jr. won the race six times.

All 11 teams and 27 drivers are set to attend the two-day outing on Sebring’s short course — the decades-long location for CART, Champ Car, and IndyCar testing — in a split format.