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CORVETTE
1965-75 Tune-up Specifications
Year
Engine or 
Car Model
Spark Plug
Type (AC) 
- Gap
Point
Gap
Dwell
Angle
Firing
Order
Ignition Timing 
(BTDC or Mark)1
Hot Idle 3
Std.
Tran
Auto
Tran 2
1965
V8-327  250 HP
44 -.035
4
28-32
18436572
475
475D
V8-327  300 HP
44 -.035
4
28-32
18436572
475
475D
V8-327  350 HP
44 -.035
4
28-32
18436572
665
-
V8-327  365 HP
44 -.035
4
28-32
18436572
12°
765
-
V8-327  375 HP
44 -.035
4
28-32
18436572
12°
850
-
V8-396  425 HP
43N -.035
4
28-32
18436572
10°
800
-
1966
8-327  300 HP
44 -.035
4
28-32
18436572
500
500D
8-327  300 HP 13
44 -.035
4
28-32
18436572
4° ATC
700
-
8-327  300 HP 14
44 -.035
4
28-32
18436572
4° ATC
-
600D
8-327  350 HP
44 -.035
4
28-32
18436572
10°
700
-
8-327  350 HP 12
44 -.035
4
28-32
18436572
10°
700
-
8-427   390 HP
43N -.035
-
-
18436572
550
550D
8-427   390 HP 12
43N -.035
-
-
18436572
600
550D
8-427 425 HP
43N -.035
-
-
18436572
800
-
1967
8-327  300 HP.
44 -.035
.019 28-32 18436572
500 11
500D 11
8-327  300 HP 13
44 -.035
.019 28-32 18436572
4° ATC
700 16
600D 16
8-327  300 HP 14
44 -.035
.019
28-32
18436572
4° ATC
700 16
600D 16
8-427 390 HP
43N -.035
.019
28-32
18436572
550 11
550D 11
8-427 390 HP 12
43N -.035
.019
28-32
18436572
700 11
550D 11
8-427 400 HP
43N -.035
.019
28-32
18436572
550 11
550D 11
8-427 400 HP 12
43N -.035
.019
28-32
18436572
750  11
600D 11
8-427 425 HP
43N -.035
.019
28-32
18436572
12° 17
1000  11
-
8-427 435 HP
43N -.035
.019
28-32
18436572
750  11
-
8-427 435 HP 12
43N -.035
.019
28-32
18436572
750  11
-
1968
8-327  300 HP
44 -.035
.019 28-32 18436572
700  11
600D 16
8-327  350 HP
44 -.035
.019
28-32
18436572
750  11
-
8-427 390 HP
43N -.035
.019
28-32
18436572
1000  11
600D 16
8-427 400 HP
43N -.035
.019
28-32
18436572
1000  11
600D 16
8-427 425 HP
43N -.035
.019
28-32
18436572
750  16
-
8-427 430 HP
43XL -.035
.019
28-32
18436572
12°
1000  16
-
8-427 435 HP
43N -.035
.019
28-32
18436572
750  16
-
1969
 
8-350 300 HP 18
R44 -.035
.019
28-32
153624
700  16
-
8-350 300 HP 19
R44 -.035
.019
28-32
153624
-
600D 16
8-350 350 HP 
R44 -.035
.019
28-32
18436572
750  16
-
8-350 370 HP 
R43-.035
.019
28-32
18436572
 20
750  16
-
8-427 390 HP
R43N-.035
.019
28-32
18436572
800  11
600D 11
8-427 400 HP
R43N-.035
.019
28-32
18436572
800  11
600D 11
8-427 425 HP
R43N-.035
.019
28-32
18436572
750  16
750D  16
8-427 430 HP
R43XL-.035
-
-
18436572
12° 5
1000  16
-
8-427 435 HP
R43N-.035
-
-
18436572
750  16
750D  16
1970
8-350 300 HP
R44-.035
.019
29-31
18436572
700
600
8-350 350 HP
R44-.035
.019
29-31
18436572
750
-
8-350 370 HP
R43-.035
-
-
18436572
900
-
8-454 390 HP
R43T-.035
.019
29-31
18436572
700
600
8-454 460 HP
R43XL-.035
-
-
18436572
700
600
1971
8-350 270 HP
R44TS-.035
.019
29-31
153624
600
550D
8-350 330 HP
R43TS-.035
-
-
18436572
700
-
8-350 365 HP
R43TS-.035
.019
29-31
18436572
600
600D
8-454 425 HP 18
R44TS-.035
-
-
18436572
700
-
8-454 425 HP 19
R44TS-.035
-
-
18436572
12°
-
700D
1972
8-350 200 HP
R44T -.035
4
29-31
18436572
800
600D
8-350 255 HP
R44T -.035
4
29-31
18436572
900
-
8-455
R44T -.035
4
29-31
18436572
750
600D
1973
8-350 190 HP
R44T-.035
4
29-31
18436572
12°
900
600D
8-350 250 HP
R44T-.035
4
29-31
18436572
900
700D
8-455 275 HP
R44T-.035
4
29-31
18436572
10°
900
600D
1974
8-350 195 HP 18
R44T-.035
4
29-31
153624
 6
900
-
8-350 195 HP 19
R44T-.035
4
29-31
18436572
-
600D
8-350 250 HP
R44T-.035
4
29-31
18436572
900
700D
8-454
R44T-.035
4
29-31
18436572
10°
800
600D
1975
8-350 18
R44TX-.060
-
-
18436572
6
800
600D
8-350 19 R44TX-.060 - - 18436572
800 700D
1- BTDC - Before top dead center

2 - D- Drive     N- neutral

3 - Where two speeds are listed, lower
speed indicates idle solenoid 
disconnected

4 - New points .019, used .016. On V8
turn adjusting screw in clockwise
until engine misfires, then back off 
1/2 turn.
5 - Adjust timing at 800 rpm

6 - CA set at 4° BTDC

9- Early production 750 rpm.
Engine date stamped 1118 QA
or QB, 950-1000 rpm

10- Transistor Ign. 6° BTDC

11- With A/C on
12- With Air Injection Reactor
system (A.I.R)

13- Manual tran & A.I.R system

14- Auto tran & A.I.R system

15- After top dead center

16- With A/C off
17- At 800 rpm

18- With standard tranny

19- With Auto tranny

20- With distributor 1111496
set at 12°