1986 Champion Spark Plug 400

The 1986 Champion Spark Plug 400 was a NASCAR Winston Cup Series racing event that was held on August 17, 1986, at Michigan International Speedway in Brooklyn, Michigan.

Michigan International Speedway has been a Ford dominated track starting in 1984, and a Mercury track before that from 1969-78. It was also a track that suited a smooth driver or a driver that could change his driving tactics for Michigan International Speedway.

Michigan International Speedway is a four-turn superspeedway that is 2 miles (3.2 km) long. Opened in 1968, the track's turns are banked at eighteen degrees, while the 3,600-foot-long front stretch, the location of the finish line, is banked at twelve degrees. The back stretch, has a five degree banking and is 2,242 feet long.

Groundbreaking took place on September 28, 1967. Over 2.5 million cubic yards (1.9×10^⁶ m³) of dirt were moved to form the D-shaped oval. The track opened in 1968 with a total capacity of 25,000 seats. The track was originally built and owned by Lawrence H. LoPatin, a Detroit-area land developer who built the speedway at an estimated cost of $4–6 million. Financing was arranged by Thomas W Itin. Its first race took place on Sunday, October 13, 1968, with the running of the USAC 250 mile Championship Car Race won by Ronnie Bucknum.

In 1972, Roger Penske purchased the speedway for an estimated $2 million. During Penske's ownership, the track was upgraded several times from the original capacity to 125,000 seating capacity.

There were 41 drivers on the starting grid for this event. Gary Fedewa (uncle of later Busch Series driver Tim Fedewa), Dick Trickle, USAC veteran Cliff Hucul of Canada, Ronnie Thomas, Joe Booher, and Howard Mark failed to qualify for this race. In this 200-lap event, Buddy Baker deserved his last-place finish due to a problem with the rear end of his vehicle on lap 27. Various problems including engine troubles and crashes caused several drivers not to finish the race. All of the drivers in this racing event were born in the United States of America, and prior to the green flag the total number of Winston Cup wins among all 41 drivers equaled 672, and a total of 20 Winston Cups.

Sixty-four thousand people witnessed a race lasting for almost three hours. Bill Elliott managed to defeat Tim Richmond by almost one and a half seconds. Tim Richmond continued his hot streak across the summer stretch, leading five laps and finishing in second place. Richmond charged from the tail-end of the lead pack to second on the final restart after being penalized by NASCAR for pitting too early under caution. After getting his lap back, Richmond charged through the field to take second.

Benny Parsons earned the pole position for this racing event by driving up to 171.924 miles per hour (276.685 km/h) during qualifying. While the opening laps in the race saw four different drivers duel each other for the lead, only Bill Elliott and Darrell Waltrip would be able to fight for the first-place position on the closing laps. Darrell Waltrip ran a clean race, staying inside the top-5 for most of the afternoon and leading 3 laps. He was rewarded with a third-place finish. Michael Waltrip would become the lowest-finishing driver to finish the race; even though he only logged in 122 laps of actual racing. Greg Sacks was involved in an accident on lap 63 while Morgan Shepherd had a similar collision on lap 83. There was a two-car crash on lap 173 involving Kyle Petty and Jim Hull. The last accident of the race occurred on lap 187 involving Benny Parsons.