40-3005101 Rocker Arm Shaft, For Hercules 3400 series engines, both diesel and Gas

40-3005101 Rocker Arm Shaft for the 3400 series engines, either gas or diesel This will be item number 3 in the Hercules picture. The 6 cylinder engine does take 2 shafts. *Warning* not all items are the same between the 4 and 6 cylinder valve train components. Rocker shafts are different.