Spark Plugs

ENGINE	PLUG TYPE	ELECTRODE GAP
3.7L V-6	ZFR6F - 11G (NGK)	1.1mm (0.043 in.)
4.7L V-8 (Intake/Upper Row)	FR8TE2	1.0 mm (.040 in.)
4.7L V-8 (Exhaust/Lower Row)	FR8T1332 (Iridium tip)	1.2mm (0.50 in.)
5.7L V-8	REC14MCC4	1.0 mm (.040 in.)
6.1L V-8	PLZTR5A-13	1.0 mm (.040 in.)