I suspect the table has a typo for the 41T combustion chamber size. The chamber in your pictures matches pictures I have of another 41T head. The combustion chamber looks very similar to a 29A head, and that is listed as 79 cc chamber. The "T" in the part number is for truck use, a lower compression application as shown by the other truck heads in the chart (81T, 99T, etc.). I suspect the 41T is closer to an 82 cc chamber instead of a 62 cc chamber. Best way to know is to put a spark plug in one of the chambers, drop a flat clear plate on it, fill it with the fluid of your choice from a graduated cylinder, and get a true measurement. Please let us know what you find if you measure a chamber.
Picture of a 29A combustion chamber:
