Drawing firm conclusions from the Roar Before the Rolex 24 at Daytona always is a dicey proposition. With IMSA officials keeping a watchful eye on manufacturer disparities, teams also are mindful about showing their hand.

The group of five Chevrolet Corvette Z06 GT3.Rs set for the season-opening Rolex 24 At Daytona completed their three days of testing at Daytona International Speedway on Sunday with the four teams focused ahead to next weekend’s twice-around-the-clock classic.

IMSA testing started with sunshine Friday during the Roar Before the Rolex 24 at Daytona International Speedway. Will it stay that way?

Daytona's annual sports-car run, the Rolex 24, began in 1962 as a 3-hour effort. It's been won by Mario Andretti and Paul Newman, among other stars.

BMW ended up fastest and topped the times in three sessions over the official Roar test ahead of this weekend’s Daytona 24 Hours IMSA SportsCar Championship season-opener. A 1m35.424s around the Daytona International Speedway from Dries Vanthoor on the opening day aboard the #24 Rahal BMW M Hybrid V8 LMDh stood as the best time of the three-day test in which GTP class machinery took to the track in six sessions.