I have a book that tells you every race Secretariat was in, and how much he carried, where he placed, who he raced, etc...
Maiden Special Weights (Aqueduct) 7/4/72 113 lbs.
Maiden Special Weights (Aquecuct) 7/15/72 113 lbs.
Allowance (Saratoga) 7/31/72 118 lbs.
The Stanford (Saratoga) 8/16/72 121 lbs.
The Hopeful Stakes (Saratoga) 8/26/72 121 lbs.
The Futurity (Belmont) 9/16/72 122 lbs.
The Champange (Belmont) 10/14/72 122 lbs.
The Laurel Futurity (Laurel) 10/28/72 122 lbs.
The Garden State (Garden State) 11/18/72 122 lbs.
The Bay Shore (Aqueduct) 3/17/73 126 lbs.
The Gotham (Aqueduct) 4/7/73 126 lbs.
The Wood Memorial (Aqueduct) 4/21/73 126 lbs.
The Kentucky Derby (Churchill) 5/5/73 126 lbs.
The Preakness (Pimlico) 5/9/73 126 lbs.
The Belmont (Belmont) 6/9/73 126 lbs.
The Arlington Invitational (Arlington) 6/30/73 126 lbs.
The Whitney (Saratoga) 8/4/73 119 lbs.
The Marlboro (Belmont) 9/15/73 124 lbs.
The Woodward (Belmont) 9/29/73 119 lbs.
The Man O' War (Belmont) 10/8/73 121 lbs.
The Canadian International Championship (Woodbine) 10/28/73 117 lbs.
I have double checked these weights in other sources and they are all correct. I have also made sure that there were no typos in either my typing or in the actual book. Just thought this might really put this to rest.