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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
.008H .016H
V8 Powerglide .035
3
26-33 18436572
4
1 Turn
2
1956-57 Six .035
3
28-35 153624 Ball 1.5 Turns
2
V8 .035
3
26-33 18436572
4
1 Turn
2
1958 Six .035
3
28-35 153624 Ball 1.5 Turns
V8 .035
3
30 18436572
4
1 Turn
1959 6- 235 .035
3
28-35 153624 Ball 1.5 Turns
8- 283 .035
3
30 18436572
4
1 Turn
8- 283
Spec. cam
.035
3
30 18436572
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
1 Turn
7
8- 283
230hp
.035
3
30 18436572
4
1 Turn
7
8-283
spec. cam
.035
3
30 18436572
4
.012H .018H
8-348
250hp
.035
3
30 18436572
4
1 Turn
7
8-348
280hp
.035
5
6
18436572
4
1 Turn
7
8-348
305hp
.035
3
30 18436572
4
1 Turn
7
8- 348
320hp
.035
3
30 18436572
4
.008H .018H
8- 348
335hp
.035
5
6
18436572
4
12° .008H .018H
1961 8-348
340hp
.035
3
30 18436572
4
.008H .018H
1961 8- 348
350hp
.035
5
6
18436572
4
.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
1 Turn
7
V8- 327 .035
3
30 18436572
4
1 Turn
7
V8- 327
spec. cam
.035
3
30 18436572
4
.008H .018H
V8-409 .035
5
6
18436572
4
12° .008H .018H
1963 6-230 .035
3
31-34 153624 1 Turn
2
V8- 283 .035
3
30 18436572
4
1 Turn
2
V8- 327
250hp
.035
3
30 18436572
4
1 Turn
2
V8- 327
300hp
.035
3
30 18436572
4
1 Turn
2
V8- 409
340hp
.035
3
30 18436572
4
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 1 Turn
2
V8- 283 .035
3
30 18436572
4
1 Turn
2
V8- 327
250hp
.035
3
30 18436572
4
1 Turn
2
V8- 327
300hp
.035
3
30 18436572
4
1 Turn
2
V8- 409
340hp
.035
3
30 18436572
4
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