relatively minor rules differences. The Indy 500 field would consist of the CART regulars, and numerous one-off ("Indy only") entries. On occasion, some of the "Indy only" entries also elected to participate in the Michigan 500 and Pocono 500 (both sanctioned by CART) given the increased stature and exposure of those two events. One of the more noticeable rule differences by USAC was allowing "stock block" engines a higher level of turbocharger boost. While most full-time CART-based teams utilized their V-8 quadcam engines at Indy, some of the smaller or "Indy only" teams elected to run stock block engines, attracted by the boost rules. USAC's Gold Crown Championship continued, settling into an unusual June through May schedule calendar. This provided that the Indianapolis 500 would be the final race of the respective season. However, during that period, the USAC Gold Crown schedule never included more than one race (i.e., Indianapolis). As such, the winner of the Indy 500 would automatically win the USAC Gold Crown Championship. CART & IRL (1996–2003): Second open-wheel "split" In 1994, Tony Hulman's grandson, Tony George, president of the Indianapolis Motor Speedway, founded the Indy Racing League (IRL), to begin competition in 1996. It would exist as a separate championship, and leveraged the fame of the Indianapolis 500, which was placed as its centerpiece. After the IRL announced that 25 teams that competed in IRL races would get automatic qualifications to the race, making it impossible for the majority of the CART field to make the race, CART teams boycotted the 1996 Indy 500. It was the beginning of the second open-wheel "split". Initially, USAC sanctioned the IRL, however after officiating controversies in 1997 at Indianapolis and Texas, the USAC was replaced by the IRL's in-house officiating. CART, which had been licensing the trademarked "IndyCar" name for several seasons, subsequently entered into a legal battle with the Indianapolis Motor Speedway (the trademark owner) over the use of the moniker. Eventually a settlement was reached in which CART gave up use of the name, but the IRL in turn could not use it until 2003. CART rebranded themselves with the CART name, and began referring to their machines as Champ Cars. CART's existing national championship remained dominant after the split for some time, initially retaining the top drivers, teams, and sponsors. However, in 2000, CART teams began to return to the Indy 500, eventually defecting permanently to