At the end of the first practice, Custer was at the top of the charts at 173.544 mph. Reddick was second with a speed of 173.249 mph. Ross Chastain, in the Kaulig Racing No. 10 (173.077 mph), Christopher Bell (172.811 mph), and Brandon Jones (172.629 mph) rounded out the top five.
Austin Cindric struggled with the balance of his car but still turned the sixth-fastest time at 172.491 mph.
In the second and final practice, Reddick was the only driver to top 173 mph. His speed was 173.611 mph. Bell was second at 172.337 mph, followed by Custer at 172.271 mph. Noah Gragson (172.260 mph) and Justin Allgaier (171.958 mph) closed out the top five.
Both practices were interrupted with a red flag. The first practice had a red flag with 17 minutes to go for debris. The second practice had some more incidents.
A red flag was displayed when Bobby Dale Earnhardt spun in turn 4 and hit the wall. Earnhardt is driving the No. 66 for MBM Motorsports and is attempting to make his first Xfinity Series race since Texas Motor Speedway last November.
Moments before the Earnhardt red flag, however, Bell roughed up the right side of his Toyota Supra on the exit of turn 4. Later in the session, Chad Finchum lost the rear end of his car off the exit of turn 2, scraped the wall down the backstretch and damaged the right rear of his car.
The Xfinity Series will qualify tomorrow at noon ET on the NBC Sports App, followed by the race at 3:00 p.m. on NBC.