Rio Bravo MX Park November 4 1973Rio Bravo MX ParkHouston, TX 500MX Results Results Home 1973 Results Rio Bravo MX Park Live & On-Demand Learn More * all times Check back for a full broadcast schedule closer to the race. 1973500MXFull Results JimWeinert1st GaryJones2nd RichThorwaldson3rd