Spark Plug Torque Chart

Spark Plug Thread Size	Aluminum Head		Iron Head
	Ft Lbs	Kg M	Ft Lbs	Kg M
10mm (Gasket)	8 - 11	1.1 - 1.5	8 - 12	1.1 - 1.7
12mm (Gasket)	10 - 18	1.4 - 2.5	10 - 18	1.4 - 2.5
14mm (Gasket)	18 - 22	2.5 - 3.0	26 - 30	3.6 - 4.1
14mm (Taper Seat)	7 - 15	1.0 - 2.1	7 - 15	1.0 - 2.1
18mm (Gasket)	28 - 34	3.9 - 4.7	32 - 38	4.4 - 5.2
18mm (Taper Seat)	15 - 20	2.1 - 2.8	15 - 20	2.1 - 2.8
7/8 - 18 inch(Gasket)	31 - 39	4.3 - 5.4	31 - 39	4.3 - 5.4

NOTE: Manufacturers' torque specifications always take precedence over the specifications shown in the table above. Exercise care when installing spark plugs as varying conditions such as temperature, threads, etc. can all have an effect on how much torque is required to seat the spark plug correctly.

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