| Year |
Engine |
AC Spark plug |
Spark Plug Gap (inches) |
Distributor Point Gap (inches) |
Point Dwell (degrees) |
Timing (degrees) |
Intake Valve (inches)
C=Cold H=Hot |
Exhaust Valve (inches) |
| early 1958* |
348 |
ACR44S |
.035 |
.016 |
30 |
8B |
Hydraulic |
Hydraulic |
| 1958-60 |
348 |
AC44N |
.035 |
.016 |
30 |
8B |
Hydraulic |
Hydraulic |
| 1959 |
348 w/spec. cam |
AC44N |
.035 |
.016 |
30 |
12B |
.008H |
.018H |
| 1960 |
348 w/spec. cam |
AC43N |
.035 |
.016 |
30 |
12B |
.008H |
.018H |
| 1961 |
348 |
AC44N |
.035 |
.019 |
30 |
8B |
Hydraulic |
Hydraulic |
| 1961 |
348 w/spec. cam |
AC43N |
.035 |
.019 |
30 |
12B |
.008H |
.018H |
| 1961 |
409 (360hp) w/spec. cam |
AC43N |
.035 |
.019 |
30 |
12B |
.008H |
.018H |
| 1962 |
409 (380/409hp) w/spec. cam |
AC43N |
.035 |
.018 |
29 |
12B |
.008H |
.018H |
| 1963 |
409 (340hp) |
AC43N |
.035 |
.019 |
28-32 |
10BTDC |
Hydraulic |
Hydraulic |
| 1963 |
409 (400/425hp) w/spec cam |
AC43N |
.035 |
.019 |
28-32 |
12BTDC |
.018H |
.030H |
| 1964 |
409 (340hp) |
AC43N |
.035 |
.019 |
28-32 |
6BTDC |
Hydraulic |
Hydraulic |
| 1964 |
409 (400/425hp) w/spec cam |
AC43N |
.035 |
.019 |
28-32 |
12BTDC |
.018H |
.030H |
| 1965 |
409 (340hp) |
AC42N |
.035 |
.019 |
28-32 |
6BTDC |
Hydraulic |
Hydraulic |
| 1965 |
409 (400hp) w/spec cam |
AC42N |
.035 |
.019 |
28-32 |
12BTDC |
.018H |
.030H |