Boys Outdoor 400m Records

Larry Byrne

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 +  = 440 yard clocking converted. "Hand-Time" conversion factors: 51.6 or under, subtract 0.2 seconds

Hand-times-are carried for historical comparative purposes by applying 0.14 "standard differential" factor, thus: 46.6 "hand" = 46.74 Auto-time...and Hand times are listed only if they are at least 0.14 seconds faster than performers' best Auto-time!