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The following is a transcript of the Lycoming SSP1776 Page 1-34  Service
Table of Limits, Section V Special torque requirements, Ref 906

Ref Chart Thread Nomenclature Torque
New Size Limit

906 All 5/16"-18 Exhaust Port 40 in lbs minimum
Studs

As an explanation the word Chart designates the engine model to which this
is applicable.
Hope this helps
Ian Crowe