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Arnold was always known for chest development and if you look at his right upper chest you can see a strong separation between the clavicular portion of the pectoralis major and the sternal rest of the pecs. Even so, prior to 1980 Schwarzenegger didn’t seem to train his upper(clavicular) pecs as much as the lower(sternal) portions as evidenced by his massive lower pec development. If you look at the picture below of Frank Zane you can see that the upper an outer portions of his pecs are more developed and the lower portion gets lost in shadow. Zane purposely concentrated on the upper and outer portions of the chest to create a strong delt/pec tie-in which makes the chest appear more angular and broader. Regular flat bench presses create more rounded pecs like you see on Arnold, Sergio Oliva, and Lou Ferrigno. However, for the 1980 Mr Olympia Arnold seemed to concentrate more on upper pecs. If you look at the picture of Schwarzenegger below Zane you will notice that Arnold’s pec/delt tie-ins were super strong and even though he still had a massive lower chest he wasn’t as lower chest dominant as in the past.