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CHEVROLET
1946-64 Tune-up Specifications
Year
Engine or 
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 Flywheel
.006H
.013H
1949-52
Std. Trans
.035
.022
31-37
153624
Ball Flywheel
.006H
.013H
1950-52
Powerglide
.035 .022 31-37
153624
Ball Flywheel
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 Flywheel
.006H
.016H
Powerglide
.035 .016 38-45
153624
Ball Flywheel
1.5 Turns  2
1955
6 Std.
.035
3
28-35
153624
Ball Flywheel
.006H
.013H
6 Powerglide
.035 3
28-35
153624
Ball Flywheel
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 Flywheel
1.5 Turns  2
V8 .035 3
26-33
18436572 4
1 Turn  2
1958
Six
.035
3
28-35
153624
Ball Flywheel
1.5 Turns  
V8 .035 3
30
18436572 4
1 Turn  
1959
6- 235
.035
3
28-35
153624
Ball Flywheel
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 Flywheel
1.5 Turns  
6- 235 Mechanical
.035 3
28-35
153624
Ball Flywheel
.008H
.015H
8- 283 170 hp
.035 3 30 18436572 4
1 Turn  7
8- 283 230 hp .035 3 30 18436572 4
1 Turn  7
8- 283 spec. cam .035 3 30 18436572 4
.012H
.018H
8- 348 250 hp .035
3
30 18436572 4
1 Turn  7
8- 348 280 hp .035
5
6
18436572 4
1 Turn  7
8- 348 305 hp .035 3 30 18436572 4
1 Turn  7
8- 348 320 hp .035 3 30 18436572 4
.008H
.018H
8- 348 335 hp .035
5
6 18436572 4
12°
.008H
.018H
8- 348 340 hp (1961) .035 3 30 18436572 4
.008H
.018H
8- 348 350 hp (1961) .035
5
6 18436572 4
.008H
.018H
8- 409 360 hp (1961)
.035
3
30
18436572  4
12°
.008H
.018H
1962
6- 235
.035
3
28-35
153624
8  Flywheel
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- 327 250 hp .035 3
30
18436572 4
1 Turn  2
V8- 327 300 hp .035 3
30
18436572 4
1 Turn  2
V8- 409 340 hp
.035
3
30
18436572  4
1 Turn  2
V8- 409 400 hp
.035
3
30
18436572  4
12°
9
V8- 409 425 hp
.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- 327 250 hp .035 3
30
18436572 4
1 Turn  2
V8- 327 300 hp .035 3
30
18436572 4
1 Turn  2
V8- 409  340 hp
.035
3
30
18436572  4
1 Turn  2
V8- 409 400 hp
.035
3
30
18436572  4
12°
9
V8- 409 425 hp
.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