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CHECKER MOTORS
1968-74 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
 
1968
 
6-230 Std tran
 
.035
 
1
 
31-34
 
153624
 
TDC
 
-
 
-
 
6-230 Auto tran
 
.035
 
1
 
31-34
 
153624
 
4°
 
-
 
-
 
8-307
 
.035
 
1
 
28-32
 
18436572
 
2°
 
-
 
-
 
8-327
 
.035
 
1
 
28-32
 
18436572
 
4°
 
-
 
-
 
8-327 2
 
.035
 
1
 
28-32
 
18436572
 
8°
 
-
 
-
 
1969
 
6-250 Std tran
 
.035
 
1
 
31-34
 
153624
 
TDC
 
-
 
-
 
6-250 Auto tran
 
.035
 
1
 
31-34
 
153624
 
4°
 
-
 
-
 
8-327 Std tran
 
.035
 
1
 
28-32
 
18436572
 
2° ATC
 
-
 
-
 
8-327 Auto tran
 
.035
 
1
 
28-32
 
18436572
 
2°
 
-
 
-
 
8-350 215 HP
 
.035
 
1
 
28-32
 
18436572
 
4°
 
-
 
-
 
8-350 300 HP
 
.035
 
1
 
28-32
 
18436572
 
4°
 
-
 
-
 
1970
 
6-250
 
.035
 
1
 
31-34
 
153624
 
4°
 
-
 
-
 
8-350 
.035
 
1
 
28-32
 
18436572
 
4°
 
-
 
-
 
1971
 
6-250
 
.035
 
1
 
31-34
 
153624
 
4°
 
-
 
-
 
8-350 3
 
.035
 
1
 
29-31
 
18436572
 
6°
 
-
 
-
 
8-350 2 
.035
 
1
 
29-31
 
18436572
 
4°
 
-
 
-
 
1972
 
6-250
 
.035
 
1
 
31-34
 
153624
 
4°
 
-
 
-
 
8-350 3
 
.035
 
1
 
29-31
 
18436572
 
6°
 
-
 
-
 
8-350 2 
.035
 
1
 
29-31
 
18436572
 
8°
 
-
 
-
 
1973
 
6-250
 
.035
 
1
 
31-34
 
153624
 
6°
 
-
 
-
 
8-350 3
 
.035
 
1
 
29-31
 
18436572
 
8°
 
-
 
-
 
8-350 2 
.035
 
1
 
29-31
 
18436572
 
12°
 
-
 
-
 
1974
 
6-250
 
.035
 
1
 
31-34
 
153624
 
6°
 
-
 
-
 
8-350 
.035
 
1
 
29-31
 
18436572
 
8°
 
-
 
-
 
1 - New .019, used .016. On V8 Turn adjusting 
screw clockwise until engine begins to 
misfire, then back off 1/2 turn.

2- Aerobus

3- Marathon & taxi

- Hydraulic lifters