Justin Allgaier wrapped up the second and final Xfinity Series practice session Friday at Auto Club Speedway with the top speed (178.059 mph).
A total of 34 drivers took to the track in the session.
Qualifying will take place Saturday at 1:10 p.m. ET.
A few hours later, the Production Alliance Group 300 race (150 laps/300 miles) will take the green flag at 5 p.m. ET (Fox Sports 1, Motor Racing Network, SiriusXM NASCAR Radio).
Cole Custer was fastest in the first of two Xfinity Series practices Friday at Auto Club Speedway in Fontana, California.
The Stewart Haas Racing driver roared around the 2-mile high speed oval in his Ford Mustang at 177.039 mph, the only driver to exceed 177 mph.
Christopher Bell was second fastest (176.882 mph), followed by the man who is getting the most attention this weekend, Kyle Busch (176.350 mph), who is seeking to become only the second driver in NASCAR history to reach 200 wins in a career.
Busch comes into this weekend with 199 career NASCAR wins: 52 in Cup, 53 in Trucks and 94 in Xfinity. He can reach 200 with a win in Saturday’s Xfinity race or in Sunday’s Cup event.
Tyler Reddick was fourth fastest in the session (175.970 mph), leading a surge of five Chevy drivers in a row, followed by Justin Allgaier in fifth (175.833), Noah Gragson (175.653), Jeremy Clements (174.834) and John Hunter Nemechek (174.478).
Rounding out the top 10 were Austin Cindric (174.338 mph) and Ryan Preece (174.350).
The final Xfinity practice will take place later this afternoon from 4:35 to 5:25 p.m. ET.