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Note: The underhood specifications sticker often reflects tune up specifications changes made in production. Sticker figures must be used if they disagree with those in this chart.


Cubic Inch Year Spark Plug Gap Point Dwell Point Gap Timing Crank Comp-Press. Valve Intake Valve Exhaust Gov. RPM No Load Fuel Press. Idle Speed STD. Idle Speed Auto
400 1971-72 .035 32 .016 7 1/2B ---- ---- ---- ---- ---- 700 700N
400 LD 1973 .035 Electronic Electronic 10B 100 ---- ---- ---- 3 1/2-5 700 700N
400 HD 1973 .035 Electronic Electronic 2 1/2B 100 ---- ---- ---- 3 1/2-5 700 700N
400 LD 1974 .035 Electronic Electronic 7 1/2B 100 ---- ---- ---- 5-7 750 750N
400 HD 1974 .035 Electronic Electronic 2 1/2B 100 ---- ---- ---- 5-7 750 750N
400 1976 .035 Electronic Electronic (3) 100 ---- ---- ---- 5-7 (3) (3)
400-1 HD 1977-78 .035 Electronic Electronic 2 (4) 100 ---- ---- ---- 5-7 700 700N
400-1 HD 1977-78 .035 Electronic Electronic 8 (5) 100 ---- ---- ---- 5-7 700 700


(1)Uses taperseat plug without tube or gasket, torque to 10 ft.lbs.
(2)TDC with automatic.
(3)See underhood specifications sticker.
(4)2 bbl Carb
(5)4 bbl Carb
LD- Light Duty Cycle
HD- Heavy Duty Cycle
LT- Under 6,000 lbs. GVW
HD- Over 6,000 lbs. GVW
Figures in parentheses are for California only.


If you have any questions e-mail me for more info.

powrwagn@f-tech.net