CHEVROLET
1946-64 Tune-up Specifications
| Year | Engine Car Model | Spark Plug Gap | Point Gap | Dwell Angle | Firing Order | Ignition Timing BTDC or Mark | Valve Lash | |
| Intake | Exhaust | |||||||
| 1946-48 | All | .040 | .022 | 31-37 | 153624 | Ball | .006H | .013H |
| 1949-52 | Std. Trans | .035 | .022 | 31-37 | 153624 | Ball | .006H | .013H |
| 1950-52 | Powerglide | .035 | .022 | 31-37 | 153624 | Ball | 1.5 Turns
2 |
|
| 1953 | Std. Trans | .035 | .016 | 38-45 | 153624 | 1 |
.006H | .013H |
| Powerglide | .035 | .016 | 38-45 | 153624 | 1 |
1.5 Turns
2 |
||
| 1954 | Std. Trans | .035 | .016 | 38-45 | 153624 | Ball | .006H | .016H |
| Powerglide | .035 | .016 | 38-45 | 153624 | Ball | 1.5 Turns
2 |
||
| 1955 | 6 Std. | .035 | 3 |
28-35 | 153624 | Ball | .006H | .013H |
| 6 Powerglide | .035 | 3 |
28-35 | 153624 | Ball | 1.5 Turns
2 |
||
| V8 Std. | .035 | 3 |
26-33 | 18436572
4 |
4° | .008H | .016H | |
| V8 Powerglide | .035 | 3 |
26-33 | 18436572
4 |
4° | 1 Turn
2 |
||
| 1956-57 | Six | .035 | 3 |
28-35 | 153624 | Ball | 1.5 Turns
2 |
|
| V8 | .035 | 3 |
26-33 | 18436572
4 |
4° | 1 Turn
2 |
||
| 1958 | Six | .035 | 3 |
28-35 | 153624 | Ball | 1.5 Turns | |
| V8 | .035 | 3 |
30 | 18436572
4 |
4° | 1 Turn | ||
| 1959 | 6- 235 | .035 | 3 |
28-35 | 153624 | Ball | 1.5 Turns | |
| 8- 283 | .035 | 3 |
30 | 18436572
4 |
4° | 1 Turn | ||
| 8- 283
Spec. cam |
.035 | 3 |
30 | 18436572
4 |
4° | .012H | .018H | |
| 8- 348 | .035 | 3 |
30 | 18436572
4 |
8 | 1 Turn | ||
| 1960-61 | 6- 235
Hydraulic |
.035 | 3 |
28-35 | 153624 | Ball | 1.5 Turns | |
| 6- 235
Mechanical |
.035 | 3 |
28-35 | 153624 | Ball | .008H | .015H | |
| 8- 283
170hp |
.035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
7 |
||
| 8-
283
230hp |
.035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
7 |
||
| 8-283
spec. cam |
.035 | 3 |
30 | 18436572
4 |
4° | .012H | .018H | |
| 8-348
250hp |
.035 | 3 |
30 | 18436572
4 |
8° | 1 Turn
7 |
||
| 8-348
280hp |
.035 | 5 |
6 |
18436572
4 |
8° | 1 Turn
7 |
||
| 8-348
305hp |
.035 | 3 |
30 | 18436572
4 |
8° | 1 Turn
7 |
||
| 8-
348
320hp |
.035 | 3 |
30 | 18436572
4 |
8° | .008H | .018H | |
| 8-
348
335hp |
.035 | 5 |
6 |
18436572
4 |
12° | .008H | .018H | |
| 1961 | 8-348
340hp |
.035 | 3 |
30 | 18436572
4 |
8° | .008H | .018H |
| 1961 | 8-
348
350hp |
.035 | 5 |
6 |
18436572
4 |
8° | .008H | .018H |
| 1961 | 8- 409
360hp |
.035 | 3 |
30 | 18436572
4 |
12° | .008H | .018H |
| 1962 | 6- 235 | .035 | 3 |
28-35 | 153624 | 8 |
1 Turn
7 |
|
| V8- 283 | .035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
7 |
||
| V8- 327 | .035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
7 |
||
| V8- 327
spec. cam |
.035 | 3 |
30 | 18436572
4 |
8° | .008H | .018H | |
| V8-409 | .035 | 5 |
6 |
18436572
4 |
12° | .008H | .018H | |
| 1963 | 6-230 | .035 | 3 |
31-34 | 153624 | 4° | 1 Turn
2 |
|
| V8- 283 | .035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
2 |
||
| V8-
327
250hp |
.035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
2 |
||
| V8-
327
300hp |
.035 | 3 |
30 | 18436572
4 |
8° | 1 Turn
2 |
||
| V8- 409
340hp |
.035 | 3 |
30 | 18436572
4 |
6° | 1 Turn
2 |
||
| V8- 409
400hp |
.035 | 3 |
30 | 18436572
4 |
12° | 9 |
||
| V8- 409
425hp |
.035 | 3 |
30 | 18436572
4 |
12° | 9 |
||
| 1964 | 6-230 | .035 | 3 |
31-34 | 153624 | 4° | 1 Turn
2 |
|
| V8- 283 | .035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
2 |
||
| V8-
327
250hp |
.035 | 3 |
30 | 18436572
4 |
4° | 1 Turn
2 |
||
| V8-
327
300hp |
.035 | 3 |
30 | 18436572
4 |
8° | 1 Turn
2 |
||
| V8- 409
340hp |
.035 | 3 |
30 | 18436572
4 |
6° | 1 Turn
2 |
||
| V8- 409
400hp |
.035 | 3 |
30 | 18436572
4 |
12° | 9 |
||
| V8- 409
425hp |
.035 | 3 |
30 | 18436572
4 |
12° | 9 |
||
1 - Before Engine No. LAA-283230 and LAQ- 117209, set timing 7/32" after timing ball. Starting with these Numbers, set it at the ball.
2- Turn the rocker arm adjusting screw down until all lash is removed. Then turn screw down additional turn specified.
3- New points .019", used .016".
4- Cylinder numbering front to rear: left bank 1357 right bank 2468
5- New points .018", used .015".
6- Each set of points 28-30° total both sets 33-35°
7- For long travel lifters 2 turns
8- First short vertical line clockwise from ball in flywheel.
9- Early production: intake .012H exhaust .020H. Engines date stamped TO-1118QA or QB: intake .018H exhaust .030H