Thanks Highflyer for helping. Any other anglers willing to help us??? I had to go catch some LMB for pictures for an upcoming article. Here is the gape of 3 of the bass I caught.
6.25" LMB Gape 0.88" (22.5mm)
9.1" LMB Gape 1.45" (37.0mm)
10.0" LMB Gape 1.57" (40.0mm)

Highflyer's data is close to my measurements.


aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management