Spark Curve comparison. Larger enginees can generally take more advance. But different head designs are th number 1 reason for different curves. NOTE: If your distributor is on the low side of the tolerance it can be 4 degrees retarded and still be in specification!
Overview
A12 advance Tolerance - why using stock timing setting is not enough
A12 Total advance Comparo
A12 Total advance Comparo - (blueprinted)
Stock A12 curves - blueprinted to high side of tolerance
A12 EXHAUST SPEC D412-63 22100-H1901
1973 USA Manual Transmission D412-80
1973 USA Auto Transmission D412-89
Other Datsun Engines
L-series comparison
P engine OHV L6 4.0-liter D608-03 22100-46500 (Patrol)
R16 OHV D417-57 22100-14700, D417-57K 22100-14705
R16 OHV D407-51 22100-14600, D407-51K 22100-14606
U20 OHC D407-52 22100-25000, D407-52K 22100-25506
L16 OHC D412-64 22100-A5502
R16 OHV D417-61 22100-A7701
L24 22100-E4601 D612-52
L24 22100-E8000 D614-52 2800 RPM