This head is virtually identical to the heads Edelbrock provided to TP (Total Performance) for there big inch EVO engines. (Head is only for 4.00 bore based EVO engines). Head is brand new, polished, fully CNC Ported, valve seats and guides are installed. I have a few complete sets that will be listed at a later date. I recall taking this to the V-TWIN EXPO back in the day and proudly displayed it at our booth. NOTE: The small hole in the combustion chamber (close to the intake valve bowl) is a compression release provision. The item "Edelbrock Harley #3006 (4.00 Bore) CNC Ported EVO Based Front Cylinder Head NOS"…