911 1970 Transmission Output Flange Torque

[whh333]

I am replacing my transmission output flange seals and need the torque spec for retightening the center bolt. My Haynes manual says 33-36 Ft. Lb. for 1972 and before, but that seems extreme. Torque spec is about half that for after 1972.

I even have the Technical Spec booklet and cannot see it in there (p. 70).

Thanks for any ideas.