The C-72 has 80.3 cc's. Depending on the sprocket and bar, it can runs several different chain pitches. 0.375 is the standard pitch. However, this saw also used several other open type and spur sprockets with .404, 7/16, and 1/2 inch pitches. You can download a parts list for this saw that may help you identify the correct chain - Search on "Homelite C-72 Parts List" or go to the following URL.