Scott Dunham, despite near-100 degree heat, set a meet high jump record today in the sixth annual East Coast Invitational age group track meet at Towson State University.

Duham, of the Cavalette-Cavaliers Track Club, recently graduated from Central High School in Prince George's County. He cleared 7 feet 3/4 inch on his third attempt. The old record, 7- 1/4, was set in 1977 by Greg Thompson of Long Island.

Nearly 2,000 athletes from 10 eastern states and the District of Colombia competed in the three-day event that ended today.

Five spectators and athletes were taken to the hospital for treatment of heat exhaustion and heat stroke. Four persons were treated Saturday.

"I had a headache from jumping in the heat," said Dunham, who cooled off in the steeplechase water jump pit after his jump, "I was frying."

Dunham's win avenged several high school competition losses to Bob Smith, the University of Maryland-bound three-time Maryland state high jump champion from Westminister. Smith cleared 6-10 for second.

Dunham, headed for George Mason University, most recently took second to Smith last month at the Region II AAU Junior Olympics in Rockville.

Other local winners included Darlene Jefferson, of Baltimore's Ms. Athletic Club and a five-time Maryland state sprint champion from Elenor Roosevelt High School, won her event easily in 23.6 seconds.

Morales of St. Margaret's, an Oxon Hill High School junior, took the 100 in 9.6 seconds. He finished second in the 220 to Clinton Davis of Pittsburgh New Image.

Michelle Glover, 17, of Willingboro, N.J. Track Club, who has been a national record holder since age 11, tied the national 17-year-old record for the 100. Glover's 10.6 seconds matched the mark set 12 years ago.