The 74 classics have too many engine variations to nail down a fixed SOP about thrust settings. For example the CF6-80C2b-1, fitted on some -300s is a completely different animal than is the CF6-50E2; some airplanes are equipped with Rollers, 524 DX series, etc..., others with different variants of the Pratts ...-7Qs and -7Rs, so it's not a good idea to make generalizations about B747 thrust settings. It's not Boeing, but the respective engine manufacturers who set engine operating thrust limits. These different engine models and different series [dash numbers] all have different start EGT, MCT, T/O, CLB, CRZ limitations. Because of this, where I fly we are not made to memorize engine limitations, but we brief before flight according to which engines are fitted on the airframe.