Ignition Timing
NOTE:
Some engines may include a magnetic timing probe socket. Insert probe into timing socket until it almost contacts vibration damper. Socket is located 9.5° ATDC. Do not use the probe location to check timing using a conventional timing light.
- On 1975-77 models, warm engine to operating temperature and ensure air cleaner is installed. Set timing with engine at idle speed and distributor vacuum hose disconnected and plugged.
- On 1978-79 models, ignition timing procedures will vary with vehicle model and component application. Refer to Emission Control Tune-Up Decal in engine compartment for correct adjustment procedures.
IGNITION TIMING SPECIFICATIONS (DEGREES BTDC@RPM)
| Application |
Timing |
| 1975-76 |
| |
260" |
| |
|
Federal |
18°@1100 |
| |
|
Calif. |
14°@1100 |
| |
All Others |
12°@600 |
| 1977 |
| |
301" |
12°@550 |
| |
305" & 350" (VIN "L") |
8°@500 |
| |
350" (VIN "R") |
20°@1100 |
| |
350" (VIN "H" & "J") |
12°@600 |
| |
403" |
| |
|
Federal |
24°@1100 |
| |
|
Calif. & High Alt |
20°@1100 |
| 1978 |
| |
301" |
12°@1100 |
| |
305" Federal |
4°@500 |
| |
305" Calif. |
6°@500 |
| |
305" High Alt |
8°@500 |
| |
350" (VIN "L") |
8°@500 |
| |
350" (VIN "R") |
20°@1100 |
| |
350" (VIN "X") |
15°@600 |
| |
403" |
20°@1100 |
| 1979 |
| |
301" |
12°@650 |
| |
305" 2-Bbl. |
4°@600 |
| |
305" 4-Bbl. |
| |
|
High Alt |
8°@600 |
| |
All Others |
4°@500 |
| |
350" (VIN "L") |
8°@500 |
| |
350" (VIN "R") |
20°@1100 |
| |
350" (VIN "X") |
15°@550 |
| |
403" |
20°@1100 |