The Keystone Invasion for the AMSOIL USAC National Sprint Car National Championship features four races in four days at Grandview, Big Diamond, BAPS, and Path Valley.
Full Replay | USAC Keystone Invasion at Big Diamond 4/23/21
Apr 24, 2021
Watch the replay of the USAC Keystone Invasion at Big Diamond Speedway from Apr 23, 2021 on FloRacing