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CORVETTE
1953-64 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
 
1953-54
 
All
 
.035
 
.015
 
41-47
 
153624
 
Ball  Flywheel
 
.010H
 
.02H
1955 
6
 
.035
 
.016
 
41-47
 
153624
 
Ball  Flywheel
 
.006H
 
.013H
 
V8
 
.035
 
.019
 
1
 
18436572 2
 
4°
 
.008H
 
.018H
1956 
All
 
.035
 
.019
 
1
 
18436572  2
 
4°
 
.008H
 
.018H
1957 
220 hp
 
.035
 
.019
 
1
 
18436572  2
 
4°
 
1 Turn 3
 
245 hp
 
.035
 
.019
 
1
 
18436572  2
 
12°
 
1 Turn 3
 
250 hp
 
.035
 
.019
 
1
 
18436572  2
 
13°
 
1 Turn 3
 
270 hp
 
.035
 
.019
 
1
 
18436572  2
 
12°
 
1 Turn 3
 
283 hp
 
.035
 
.019
 
1
 
18436572  2
 
6°
 
.012H
 
.018H
1958-59 
230 hp
 
.035
 
4
 
30
 
18436572  2
 
4°
 
Zero
 
Zero
 
245 hp
 
.035
 
4
 
30
 
18436572  2
 
4°
 
1 Turn 3
 
250 hp
 
.035
 
5
 
1
 
18436572  2
 
4°
 
1 Turn 3
 
270 hp
 
.035
 
5
 
1
 
18436572  2
 
7°
 
.012H
 
.018H
 
290 hp
 
.035
 
5
 
1
 
18436572  2
 
14°
 
.012H
 
.018H
1960-61 
230 hp
 
.035
 
4
 
30
 
18436572  2
 
4°
 
1 Turn 3
245 hp .035 4 30 18436572 2 
12°
 
1 Turn 3
270 hp .035 5 1 18436572 2 
12°
 
.012H
 
.018H
275 hp .035 5 1 18436572 2 
8°
 
.012H
 
.018H
315 hp .035 5 1 18436572 2 
18°
 
.012H
 
.018H
1962 
250 hp
 
.035
 
4
 
30
 
18436572  2
 
4°
 
1 Turn 3
300 hp .035 4 30 18436572 2 
8°
 1 Turn 3
340 hp .035 5 1 18436572 2 
10°
 .008H .018H
360 hp .035 5 1 18436572 2 
10°
 .008H .018H
1963 
250 hp
 
.035
 
5
 
30
 
18436572  2
 
4°
 
1 Turn 3
 
300 hp
 .035 5 30 18436572 2 
8°
 
1 Turn 3
 
340 hp
 .035 5 30 18436572 2 
10°
 
.008H
 
.018H
 
360  hp
 .035 5 30 18436572 2 
10°
 
.008H
 
.018H
1964 
250 hp
 
.035
 
5
 
30
 
18436572  2
 
4°
 
1 Turn 3
 
300 hp
 .035 5 30 18436572 2 
8°
 
1 Turn 3
 
365 hp
 .035 5 30 18436572 2 
10°
 
.030H
 
.030H
 
365 hp
 .035 5 30 18436572 2 
10°
 
.030H
 
.030H
 
1 -  Each set of points 28-30° , total dwell 
both sets 33-35°

2 - Cylinders numbering front to rear:
Right bank 2468  left bank 1357
 
3 - Turn rocker adjusting screw clockwise until
all lash is removed. Then addition turns specified. 

4 - New points .018" , used .015"

5- New points .019" , used .016"