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Kev, In the late 50s when the FE evolved from the Y-block it was targeted for heavy, full size cruisers and and pickup trucks. Torque was the requirement of the day. That mandated small ports and valves were great for low RPM torque. That recipe served well for irrigation pumps and old-timey dump trucks too. The hemis, they originated around 300 ci and always were dual-quad high winders. They were also placed initially in full-size cars but... their honker ports and larger valves were the recipe for high-winding excitement. So, yes, it's pretty much the hemis head design and increased flow capacities. That was the major diffierence.

brandx, you're in the wrong thread... Their's three others that deals with not enough, too much and simply rediculous. That was never the question here.