Wednesday, June 29, 1988 – NASCAR officials seized the intake manifolds from five of its premier series teams and quickly fined the five drivers $5,000 each prior to practice for the Firecracker 400 at Daytona International Speedway. The drivers fined were Davey Allison (Ranier Racing), Buddy Baker (Baker/Schiff Racing), Ken Bouchard (Whitcomb Racing), Dale Jarrett (Hoss Ellington) and Cale Yarborough (Cale Yarborough Motorsports).
• NASCAR determined the teams were attempting to get around the limitations of the 1-inch restrictor plate in use for the upcoming race by altering the manifolds. Some manifolds had small holes bored in them while others were not seated flush against the gasket, allowing air into the engine
• Officials also confiscated a faulty gasket from the Ford driven by Kyle Petty, however the third-generation driver was not fined.
• Winston Cup director Dick Beatty said he informed teams that officials would be on the lookout for anyone attempting to get around the horsepower-restricting plates. Anyone caught a second time for a similar infraction would be suspended for 12 weeks.