The United Racing Company, one of the oldest sanctioning bodies in the United States, invades Williams Grove Speedway tonight and heads south to the Lincoln Speedway Saturday night for 358/360 Challenge Series events at both tracks.

Tonight's show at Williams Grove features the URC stars, powered by 360 cubic inch engines battling the 358 cubic inch powered Central Pennsylvania regulars in a 25-lap feature event, paying $4,000 to the winner. Along with the Central Pa. 358 regulars, the URC stars and some outsiders, a few 410 sprint car regulars have dropped to a smaller engine in their sprinter to compete in the event. The defending event winner of 2012 is NASCAR star Tony Stewart.

The 410s are also on the docket tonight. A full program of qualifying events for both divisions will lead up to 25-lap feature events for each respective class. Gates open at 5 p.m. and racing begins at 7:30.

The 1000cc Sidewinder sprints are also in action Saturday at Lincoln, and the weekly 410 sprint cars are not scheduled for racing action.

Nostalgia racing continues to be on the upswing, most noticeably in drag racing, as fans can identify with the cars and stars of their youth.

Along with the popular shows at Beaver Springs Dragway and the annual Funny Car Reunion at Englishtown, N.J., Maple Grove Raceway presents its popular "Geezers at the Grove" show this weekend.

The three-day show begins today and continues through Sunday. The Nitro nostalgiafunny cars will be featured in two qualifying sessions this evening at 7 and 9, and their eliminations are slated to kick off Saturday afternoon.

Along with the Nostalgia Super Stockers, F/X cars, gassers, front-engined dragsters and altereds competing throughout the weekend, a car cruise and show corral will also be part of the show. Specialty cars include the Danny O'Day wheelstander and Bob VanSciver's jet dragster.

Funny Car names expected to be part of the Nitro Nostalgia program include the "Blue Max", " Poverty Stricken", "Jungle Jim", "Brande X" and a host of others to complete the 16-car field.

In local dirt track racing Big Diamond Speedway hosts the 358 modifieds, sportsman, roadrunners and the Pa. Legends cars tonight. Also, the top 11 drivers in points will compete in a special one-on-one, one-lap match race challenge.

Selinsgrove Speedway returns to action Saturdaywith a special Late Model Summer Championship paying $2,000 to the winner. The stock car starswill be looking to dial their cars in for the upcoming two-day World of Outlaws Late Model special over the Labor Day Weekend. The 358 sprinters, pro stocks and roadrunners are also on the program. Also in action Saturday is Grandview Speedway with its popular show of 358 modifieds, sportsman and late models. Hagerstown Speedway features the late model sportsman, pure stocks and hobby stockers. Williams Grove's $5 Saturday Night special features the winged super sportsman, limited late models and street stocks as part of the Kids Night program.

Port Royal Speedway offers its "Living Legends Dream Race" for the 410 sprint cars Saturday night, paying the winner of the 30-lap feature event a minimum of $10,000 with plenty of contingencies available. The night will also include a tribute to former star driver Todd Shaffer along with his car owners of the famed #88, Gary and Patty Beam.

The NHRA Mello Yello Drag Racing Series heads to Pacific Raceways in Washington state, the final leg of the western swing, for the 26th Annual O'Reilly Auto Parts Northwest Nationals. The race is the 16th event of the 24 national events on the 2013 schedule. Teams continue to try to secure spots in the points standings heading into the upcoming "Countdown to the Championship" playoff. Winners last weekend at Sonoma were Shawn Langdon (T/F), Ron Capps (F/C), Vincent Nobile (P/S) and Hector Arana Jr. (P/S Bike). ESPN2 will provide qualifying action tomorrow evening from 10:30 p.m. to midnight and three hours of eliminations on Sunday evening at 7 p.m.