Driving a Chevrolet Monte Carlo, Jeff Green clocked 153.355 miles per hour around the 1.017-mile North Carolina Speedway to barely bump older brother David, who had posted a speed of 153.329 mph in his Chevrolet.
"The Rock has been pretty good to me," Jeff Green said. "We all thought we had a lap good enough to be in the top five. But I think this surprised all of us, including me."
Rounding out the trio was Mark Green, who qualified 10th at 152.690 miles per hour in a Ford Taurus and ended a run of nine Chevrolets at the front of the pack.
The brothers hail from Owensboro, Ky.
"This is probably the toughest of the three tracks that we have left, but we've always qualified well," Biffle said. "We run pretty good here, but it's a tough track."
In trying to close the gap on Biffle, Keller has Saturday's race, followed by the final two Busch events at Phoenix International Raceway and Homestead-Miami Speedway
"I've been real disappointed," Keller said. "We can't find the balance we need, or we think we need, so we're trying to basically do what we did here in the spring as far as setups. For some reason, we haven't been able to run exactly what we ran here in the spring. We need to try some different things."
Keller won the Busch race here in February.