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.
Flashback: USAC Sprints at Big Diamond 6/23/21
Apr 24, 2021
Watch the USAC National Sprint Cars feature highlights at Big Diamond Speedway from Apr 23, 2021 on FloRacing