Yes, Squad's post looks about right, Ken Patera and Kazmaier's chests were only 58-59 inches at 80-100lbs heavier.
The great Steve Reeves was close to Arnold's weight many times, and his claimed chest size only in the 48-52 range depending on year.
Think about some of these magical numbers attributed to Arnold, if any other bodybuilder claimed them, we'd be calling bullshit all day long.