1983 Indianapolis 500

The 67th Indianapolis 500 was held at the Indianapolis Motor Speedway in Speedway, Indiana, on Sunday, May 29, 1983. After finishing second three times (1977, 1978, 1980), winning the pole position twice (1977–1978), and being the fastest qualifier one additional time (1981), Tom Sneva finally shook his "bridesmaid" status and won his first and only Indianapolis 500. The win also represented the record seventh Indy victory with which chief mechanic George Bignotti was involved.

In the final twenty laps, three-time winner Al Unser Sr. was leading Tom Sneva. Unser was seeking his record-tying fourth Indy victory. His son, rookie Al Unser Jr., was several laps down, but was positioned right behind his father. Al Jr. created a firestorm of controversy when it appeared that he was blocking Sneva intentionally to aid his father. Unser Jr. admitted to running interference for his father, claiming he was trying to create "dirty air" and turbulence for Sneva. He stopped short, however, of calling it "blocking". After several anxious laps, Sneva finally slipped by both Al Jr. and Al Sr., using heavy traffic to his advantage. Sneva opened up an 11-second lead, and took the checkered flag for his long-awaited Indy victory.

Rookie Teo Fabi headlined time trials by winning the pole position, and on race day he led the first 23 laps. Fabi's day was short, however, as he dropped out with a bad fuel gasket. The effort earned him the rookie of the year award. Fabi would go on to win four races during the season and finished second to Al Unser Sr. for the CART points championship.

The 1983 Indy 500 ushered in a new era of civility and stability in the sport of Indy car racing. After four years of conflict and organizational disputes between USAC and CART, the two sanctioning bodies came to an amicable truce. The Indianapolis 500 would be sanctioned singly by USAC, and officially would be part of the ceremonial Gold Crown championship. However, the race was now recognized on the CART schedule, and counted towards the 1983 CART PPG Indy Car World Series points championship. The field for the Indy 500 going forward would consist primarily of CART-based teams, along with numerous one-off ("Indy-only") entries. Despite various squabbles and minor technical differences between the sanctioning bodies, this arrangement would remain in place, with relative harmony, through 1995.

The USAC technical committee issued rule changes for 1983, scaling back side skirts and declaring that "all bodywork or aerodynamic devices must be at least one inch above the bottom of the car's tub." During time trials, a total of 15 cars in the qualifying line would fail pre-qualifying technical inspection, raising tempers and drawing the ire of competitors. Some teams charged that USAC was inconsistent in their enforcement and their measuring, since they used a different (and possibly less-accurate) tool than the CART series officials utilized at other races. Some teams claimed the first several cars in line were not scrutinized as heavily as those deeper in line. In addition, turbocharger "boost" settings were reduced to 47 inHg, down from 48 in 1982.

The evolving aerodynamic rules coincided with the emergence of the Robin Herd-designed March chassis becoming the vehicle of choice for the mid-1980s. The March had debuted at Indy in 1981 with the 81C, followed up by the 82C in 1982. Coupled with the widely used Cosworth DFX engine, the "customer car" era began to dominate the sport of Indy car racing. Penske, among other teams, elected to scale back, or even abandon their in-house chassis programs in favor of the English-built March for the next few seasons. The March's aerodynamic advancements, downforce, and affordable cost were among the reasons it emerged as the favorite among the competitors. The "customer car" era also was popular with the smaller-budget teams, as it allowed them access to top equipment, leveling the playing field, and shrinking the differences between haves and the have-nots. March rolled out their new 83C and with a few teams still running the 81C and 82C, March took 18 of the 33 starting positions, including the pole position during time trials. On race day, March notched their first "500" win, and placed five cars in the top nine. The 1983 race would be the first of five consecutive Indy 500 victories for March Engineering.

Pole day time trials was scheduled for Saturday May 14. Rain, however, kept cars off the track nearly all day. At 4:15 p.m., the track finally opened for practice, but it was brief and interrupted by several yellow lights. Officials closed the track at 5:49 p.m., without a single car making a qualifying attempt. On Sunday May 15, rain washed out the entire day. It was the first time since 1978 that not a single car qualified on the first weekend. Pole day time trials was moved to the second weekend, with the USAC rule stating once the cars made one rotation around the qualifying draw, "pole qualifying" ends and third day qualifying begins.

Three-time winner Johnny Rutherford was sidelined after two major crashes. On May 8, he crashed in turn one, suffering minor injuries. On May 18, he suffered a more serious crash in turn 3. He broke his left foot and left ankle, and was forced to sit out the 1983 race.