Main 3, cap:
main cap 3.jpg


Main 4, cap:
main cap 4.jpg


Main 5, cap:
main cap 5.jpg


I haven't looked into the number yet, but the first thing that caught my eye was the difference between the main cap bearings for 1, 2, and 4: 1 has 973S on it, but 2 and 4 have 974S on them, even though the part number for all 3 is the same, and the block side bearings for all 3 mains are exactly the same.