Biffle will not face discipline for car height

NASCAR will not penalize Greg Biffle's No. 16 team, despite the fact his Ford was found to be too low in post-race inspection at Bristol Motor Speedway, NASCAR officials said Wednesday.

NASCAR has scheduled a news conference for Friday morning at Martinsville Speedway to explain their reasoning in detail.

NASCAR took the No. 16 car back to its research and development center Sunday night after the Food City 500 and gave it a thorough inspection Monday.

Officials determined that no unapproved adjustments had been made to the car, so NASCAR cleared the machine and returned it to Roush Fenway Racing on Monday afternoon.

The 2007 season began with a new, less tolerant approach toward rules violators, prompting many to suspect that Biffle and his team would receive a stiff penalty following the Bristol mishap.

But NASCAR officials said the Car of Tomorrow is a work in progress, and that they anticipated the cars would lose some height during the race at Bristol.

Officials ran eight cars through the height sticks during post-race inspection, and Biffle's was the only one that came back too low.

Kyle Busch's crew chief, Alan Gustafson, told ESPN on Monday that his car was very close to being too low, and that he was perplexed as to why.

Before making any permanent changes, NASCAR said it will likely make some rules adjustments in the future that benefit everyone.

Marty Smith covers Nextel Cup racing for ESPN.com.