Found this in the Mustang dyno operators manual:

Quote
When engine RPM is not available, there is no way to report an engine crankshaft relative torque value.


If it’s not engine crankshaft relative, then it won’t necessarily cross at 5252, since it’s also not rpm related.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads