Mrs. Jean Clarkson, a Yorkshire, England housewife who had not handled a rifle until her husband taught her seven years ago, outpointed 744 of Britain's finest shots (including her husband, Harry) to become the first woman ever to win the national small-bore title.

Alan Eikel, 14, of Raytown, Mo., led his family in dominating the Missouri Valley AAU diving meet as he took the one-and three-meter intermediate titles. Don, 12, won the same junior events. Sandy, 11, and Patty, 9, were the one-meter girls' and midget champs.

Cathy Hamblin, 14, a member of the Albuquerque Olympette Track Club, recorded a world's best for her age in her first attempt in the pentathlon at a New Mexico AAU men's meet with a 3,893-point total, bettering Briton Vivian Knowles's 1965 mark by 31.

Dick Genth, a 42-year-old Miami boat-builder, piloted his brand new yellow 28-foot powerboat, Thunderbird IV, to a 5:23.30 first-place finish in the 253-mile Long Island (N.Y.) Marathon, beating his fellow Miamian and last year's winner, Allan Brown, by 1:30.

Teresa Weinshilboum, 15, a golfer from Ponca City, Okla., won the state girls' junior title for the second consecutive year when she retained medalist honors with a three-over-par 76, then defeated last year's runner-up, Louise Stekoll, in the finals 4 and 3.

Robert Gallis, a window washer from Laurel, Md. who has a 128-game average in duckpin bowling with the 240 Mixed Doubles League in Silver Spring, rolled games of 210,149 and 190 for a world record 549, breaking Arthur Lemke's 24-year-old mark by seven pins.