Belknap was a sensation when he burst on the scene in 1980 or so! He was 5'4" or shorter, not sure exactly. Tim had the best legs since Platz and a split in his chest reminiscent of Franco Columbu. He beat Rory Leidelmeyer in the LHW class and beat Lance Dreher (HW) for the overall at the 1981 Mr. America.
I saw the contest on HBO, back when they used to cover the Mr. America. Those days are long gone now.
Belknap couldn't ever win his class at the IFBB Worlds but fared better in NABBA competition.