Hi, can anyone help me with these questions on Datsun 1200 M30 heads
1 - Did all Datsun/Nissan 1200 M30 numbered heads came out with the same manifold stud pattern?, new, old or both?
2 - What model vehicles came out with these heads?
3 - What does the other 3 numbers on the heads represent?, example, M30 063 or M30 042, etc etc, there seems to be so many M30 heads with different 3 number make ups?