CORVETTE
1965-75 Tune-up Specifications
| Year | Engine 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
250hp |
44 -.035 | 4 |
28-32 | 18436572 | 4° | 475 | 475D |
| V8-327
300hp |
44 -.035 | 4 |
28-32 | 18436572 | 8° | 475 | 475D | |
| V8-327
350hp |
44 -.035 | 4 |
28-32 | 18436572 | 8° | 665 | - | |
| V8-327
365hp |
44 -.035 | 4 |
28-32 | 18436572 | 12° | 765 | - | |
| V8-327
375hp |
44 -.035 | 4 |
28-32 | 18436572 | 12° | 850 | - | |
| V8-396
425HP |
43N -.035 | 4 |
28-32 | 18436572 | 10° | 800 | - | |
| 1966 | 8-327
300hp |
44 -.035 | 4 |
28-32 | 18436572 | 6° | 500 | 500D |
| 8-327
300hp 13 |
44 -.035 | 4 |
28-32 | 18436572 | 4° ATC | 700 | - | |
| 8-327
300hp 14 |
44 -.035 | 4 |
28-32 | 18436572 | 4° ATC | - | 600D | |
| 8-327
350hp |
44 -.035 | 4 |
28-32 | 18436572 | 10° | 700 | - | |
| 8-327
350hp 12 |
44 -.035 | 4 |
28-32 | 18436572 | 10° | 700 | - | |
| 8-427
390hp |
43N -.035 | - | - | 18436572 | 4° | 550 | 550D | |
| 8-427
390hp 12 |
43N -.035 | - | - | 18436572 | 4° | 600 | 550D | |
| 8-427
425hp |
43N -.035 | - | - | 18436572 | 8° | 800 | - | |
| 1967 | 8-327
300hp |
44 -.035 | .019 | 28-32 | 18436572 | 6° | 500
11 |
500D
11 |
| 8-327
300hp 13 |
44 -.035 | .019 | 28-32 | 18436572 | 4° ATC | 700
16 |
600D
16 |
|
| 8-327
300hp 14 |
44 -.035 | .019 | 28-32 | 18436572 | 4° ATC | 700
16 |
600D
16 |
|
| 8-427
390hp |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 550
11 |
550D
11 |
|
| 8-427
390hp 12 |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 700
11 |
550D
11 |
|
| 8-427
400hp |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 550
11 |
550D
11 |
|
| 8-427
400hp 12 |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 750
11 |
600D
11 |
|
| 8-427
425hp |
43N -.035 | .019 | 28-32 | 18436572 | 12°
17 |
1000
11 |
- | |
| 8-427
435hp |
43N -.035 | .019 | 28-32 | 18436572 | 5° | 750
11 |
- | |
| 8-427
435hp 12 |
43N -.035 | .019 | 28-32 | 18436572 | 5° | 750
11 |
- | |
| 1968 | 8-327
300hp |
44 -.035 | .019 | 28-32 | 18436572 | 4° | 700
11 |
600D
16 |
| 8-327
350hp |
44 -.035 | .019 | 28-32 | 18436572 | 4° | 750
11 |
- | |
| 8-427
390hp |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 1000
11 |
600D
16 |
|
| 8-427
400hp |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 1000
11 |
600D
16 |
|
| 8-427
425hp |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 750
16 |
- | |
| 8-427
430hp |
43XL -.035 | .019 | 28-32 | 18436572 | 12° | 1000
16 |
- | |
| 8-427
435hp |
43N -.035 | .019 | 28-32 | 18436572 | 4° | 750
16 |
- | |
| 1969 | 8-350
300hp 18 |
R44 -.035 | .019 | 28-32 | 153624 | 4° | 700
16 |
- |
| 8-350
300hp 19 |
R44 -.035 | .019 | 28-32 | 153624 | 4° | - | 600D
16 |
|
| 8-350
350hp |
R44 -.035 | .019 | 28-32 | 18436572 | 8° | 750
16 |
- | |
| 8-350
370hp |
R43-.035 | .019 | 28-32 | 18436572 | 20 |
750
16 |
- | |
| 8-427
390hp |
R43N-.035 | .019 | 28-32 | 18436572 | 4° | 800
11 |
600D
11 |
|
| 8-427
400hp |
R43N-.035 | .019 | 28-32 | 18436572 | 4° | 800
11 |
600D
11 |
|
| 8-427
425hp |
R43N-.035 | .019 | 28-32 | 18436572 | 4° | 750
16 |
750
D 16 |
|
| 8-427
430hp |
R43XL-.035 | - | - | 18436572 | 12°
5 |
1000
16 |
- | |
| 8-427
435hp |
R43N-.035 | - | - | 18436572 | 4° | 750
16 |
750
D 16 |
|
| 1970 | 8-350
300hp |
R44-.035 | .019 | 29-31 | 18436572 | 4° | 700 | 600 |
| 8-350
350hp |
R44-.035 | .019 | 29-31 | 18436572 | 8° | 750 | - | |
| 8-350
370hp |
R43-.035 | - | - | 18436572 | 8° | 900 | - | |
| 8-454
390hp |
R43T-.035 | .019 | 29-31 | 18436572 | 6° | 700 | 600 | |
| 8-454
460hp |
R43XL-.035 | - | - | 18436572 | 8° | 700 | 600 | |
| 1971 | 8-350
270hp |
R44TS-.035 | .019 | 29-31 | 153624 | 8° | 600 | 550D |
| 8-350
330hp |
R43TS-.035 | - | - | 18436572 | 8° | 700 | - | |
| 8-350
365hp |
R43TS-.035 | .019 | 29-31 | 18436572 | 8° | 600 | 600D | |
| 8-454
425hp 18 |
R44TS-.035 | - | - | 18436572 | 8° | 700 | - | |
| 8-454
425hp 19 |
R44TS-.035 | - | - | 18436572 | 12° | - | 700D | |
| 1972 | 8-350
200hp |
R44T -.035 | 4 |
29-31 | 18436572 | 8° | 800 | 600D |
| 8-350
255hp |
R44T -.035 | 4 |
29-31 | 18436572 | 4° | 900 | - | |
| 8-455 | R44T -.035 | 4 |
29-31 | 18436572 | 8° | 750 | 600D | |
| 1973 | 8-350
190hp |
R44T-.035 | 4 |
29-31 | 18436572 | 12° | 900 | 600D |
| 8-350
250hp |
R44T-.035 | 4 |
29-31 | 18436572 | 8° | 900 | 700D | |
| 8-455
275hp |
R44T-.035 | 4 |
29-31 | 18436572 | 10° | 900 | 600D | |
| 1974 | 8-350
195hp 18 |
R44T-.035 | 4 |
29-31 | 153624 | 8°
6 |
900 | - |
| 8-350
195hp 19 |
R44T-.035 | 4 |
29-31 | 18436572 | 8° | - | 600D | |
| 8-350
250hp |
R44T-.035 | 4 |
29-31 | 18436572 | 8° | 900 | 700D | |
| 8-454 | R44T-.035 | 4 |
29-31 | 18436572 | 10° | 800 | 600D | |
| 1975 | 8-350
18 |
R44TX-.060 | - | - | 18436572 | 6°
6 |
800 | 600D |
| 8-350
19 |
R44TX-.060 | - | - | 18436572 | 6° | 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°