Bill Elliott, taking advantage of a series of late caution flags, charged into the lead 11 laps from the end and held off Harry Gant to win the Van Scoy 500 Grand National stock car race yesterday.

Elliott, driving a Ford Thunderbird, finished at Pocono International Raceway in Long Pond, Pa., .4 of a second ahead of Gant's Chevrolet Monte Carlo SS. Darrell Waltrip was third. Geoff Bodine, the leader most of the way, took fourth.

It was the sixth victory of the season for Elliott, all on superspeedways -- tracks one mile or more in length. He now has won at least once on each of the eight superspeedways that the Grand National circuit races on, as well as winning eight of his last 13 tries on the longer ovals.

For Gant, it was a fourth straight second-place finish and 24th of his Grand National career.

The winner averaged 138.975 mph, shy of the track record of 142.540 set by Waltrip in 1978. Speed was reduced in the last 25 of the 200 laps by a flurry of four caution flags . . .

Chris Fahan of Redding, Conn., took the lead on the final lap and won the 23-lap Formula Ford Summit Point (W.Va.) National road race.

Jim Oseth of Springfield, Va., was leading a racelong duel with John Gimbel, Manchester, Conn., on the two-mile, 10-turn asphalt raceway until Oseth spun his Reynard in turns one and three and blocked Gimbel, driving a Swift. Both fell back and Fahan, in a Reynard, took over, with Richard Bahmer of Woodbridge, Va., coming on for second.