From Amarillo:
I-40 E to 1912 Exit. Go North to Hwy 60, go right & head East to Pampa, TX. At Hwy 70, turn right (South) approx. 2 miles then turn left on Hwy 273 (East) to Lefors . The track will be visible to your left on the hill next to the silver water storage tower. Tumbleweed Road or SkyLine will take you to the track.
Coming from the East, take I-40 W. Turn right onto TX 273. Go to TX Spur 398. Lefors is just to the SouthEast of Pampa, TX. It does show up on Google Maps./Mapquest if you need further directions...