SPARK PLUG TORQUE CHART:

GASKET-TYPE PLUGS: Torque Limits

PLUG SIZE

CAST-IRON HEAD

ALUMINUM HEAD

10 mm

8 - 12 Lbs/Ft.

8 - 12 Lbs/Ft.

12 mm

10 - 18 Lbs/Ft.

10 - 18 Lbs/Ft.

14 mm

20 - 30 Lbs/Ft.

18 - 22 Lbs/Ft.

18 mm

32 - 38 Lbs/Ft.

28 - 32 Lbs/Ft.

GASKET-TYPE PLUGS: Turn Limits

PLUG SIZE

CAST-IRON HEAD

ALUMINUM HEAD

10 mm

1/4 Turn

1/4 Turn

12 mm

1/4 Turn

1/4 Turn

14 mm

1/4 - 3/8 Turn

1/4 Turn

18 mm

1/4 Turn

1/4 Turn

TAPER SEAT PLUGS: Torque Limits

PLUG SIZE

CAST-IRON HEAD

ALUMINUM HEAD

14 mm

10 - 20 Lbs/Ft.

10 - 20 Lbs/Ft.

18 mm

15 - 20 Lbs/Ft.

15 - 20 Lbs/Ft.

TAPER SEAT PLUGS: Turn Limits

PLUG SIZE

CAST-IRON HEAD

ALUMINUM HEAD

14 mm

1/16 Turn

1/16 Turn

18 mm

1/16 Turn

1/16 Turn

Turns: Install finger tight plus number of turns listed in chart.

Info From Hot Rod 1-75

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