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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
-
-
8-307
.035
1
28-32
18436572
-
-
8-327
.035
1
28-32
18436572
-
-
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
-
-
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
-
-
8-350 300 HP
.035
1
28-32
18436572
4°
-
-
1970
6-250
.035
1
31-34
153624
-
-
8-350 
.035
1
28-32
18436572
4°
-
-
1971
6-250
.035
1
31-34
153624
-
-
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
-
-
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
-
-
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
-
-
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