is it a 74 or 80 inch shovelhead cylinder?

One of the most common questions is “Do I have a 74 or 80 inch shovelhead cylinder?” Shovelhead cylinders are basically the same on the outside dimensions. The bore of the cylinders is however different. Standard size 74″ cylinders are 3 7/16″ or, 3.4380″ and 80″ cylinders are 3 1/2″ or, 3.498″ . Visually it … Read more