Saturday night the Bullring at Las Vegas will welcome a group of first-time visitors. The Pro-4 Series, which is similar to the Bullring¿s Super Late Model division, will make its first and only appearances this year at the Bullring. The Pro-4 feature is part of the ASA Racing Lucas Oil Products Tri-State Challenge, which is a five-race series. Pro-4 recently became affiliated with the American Speed Assoc. (ASA), and the Tri-State Challenge will be the first series under the new contract. Pro-4 cars are slightly smaller than the Super Late Models, which allows for more side-by-side racing. The cars run on a four-cylinder engine, and have an average racing speed of about 90 miles per hour. Drivers from California, Arizona, Utah and Idaho will make up the estimated 25 to 30 car racing field. ¿This will be exciting for the drivers as well,¿ said Bob Coply, Pro 4 Series race director. ¿The drivers predominantly drive at their home tracks, which are Orange Hills Speedway in Calif., Rocky Mountain Raceway in Utah and Meridian Speedway in Idaho.¿ Coply went on to explain that the drivers participate in weekly series¿ at their home tracks, much like the Dodge Weekly Series at the Bullring. Drivers in Idaho and Utah participate in the Late Model Lights weekly circuit while drivers in California participate in the Pro-4 Late Model Division. Featured drivers for the event include, Dennis Andrews from Redlands, Calif., Brady Nish from Salt Lake City and Kenny Chandler from Idaho. The ASA Racing Lucas Oil Products Tri-State Challenge will begin at the Bullring on Saturday and will include four more events throughout the summer. The Pro-4¿s will visit Bakersfield, Calif. on July 17, Meridian, Idaho on Sept. 11, San Bernardino, Calif. on Oct. 9 and Blithe, Calif. on Nov. 27. ¿These cars handle well, are quick and fun to watch,¿ Coply said. ¿It should make for exciting racing, and we, along with the drivers, are looking forward to the series.¿ Spectator gates open at 6 p.m. Qualifying is set for 6:20 with racing at 7:20. General admission is $11 for adults, $9 for senior citizens/ military personnel and $4 for children 6-12. Children five and under are free. A Family Four Pack can be purchased for $24. Admission to the Stockyard is $36 per vehicle (up to four people). Pit gates open at 3:30 p.m. Admission is $20 for NASCAR members and $25 for non-members.