American discus star Mac Wilkins unleashed a heave of 232 feet 10 1/2 inches, the world's longest toss this year and only seven inches short of Wolfgang Schmidt's world record at the Helsinki World Games track and field competition today.

Wilkins bested his own American record and countryman Al Oerter's stadium record as he stunned competitors and spectators with his opening throw on the first day of the two-day meet.

The 1976 Olympic Champion, who will not go to the Moscow Olympics because of the U.S. boycott, twice bettered the stadium record at Stockholm's Olympic stadium two days ago, winning on a toss of 227-19 1/2.

Wilkens' eclipsed U.S. mark of 232-6 was the world standart until East German Schmidt topped ti with 233-5 last year. Kenyan Kiprotich Rono ran 5,000 meters in Nairobi Sunday in 13:46.04 and the prompted him to buy a flight ticket to Helsinki the next day. Today he clocked a sizzling 8:17.93 at the lower altitude to win the 3,000-meter steeplechase.

Kenya also is boycotting the Olympics, but the two Finns who finished second and third to Rono qualified for places on their Olympic team. Tommy Ekblom clocked 8:20.20 and Vesa Raukkanen 8:24.45.

In the 200 meters; Anthony Davis of Jamaica won in 21.89, nipping Cuba's Carlos Reite (21.98).

An East German quartet equaled that nation's world record for the wo