GMC Sierra 2500 Spark Plug Replacement

Gap 0.040in; Plug Type RS12YC

Gap 0.060 Resistor Plug with Patented U-Groove Design

Original Center Electrode and Ground Electrode Material is Platinum Do Not Gap, Gap is Preset

Gap 0.040"

Original Center Electrode Material is Iridium Do Not Gap, Gap is Preset

Gap 0.040in; Plug Type RS14PMC4

Gap: .040/1.0mm Enhanced Tapered Ground Electrode w/ Platinum Chip

Gap 0.040"

Gap 0.040 Platinum TT - Twin-Tip Technology Design with Platinum Center Electrode and Titanium Enhanced Ground Strap

Original Center Electrode Material is Iridium Do Not Gap, Gap is Preset

Gap .040 (in)

Gap 0.040in; Plug Type RS14PMP4

Original Center Electrode and Ground Electrode Material is Platinum Do Not Gap, Gap is Preset

Original Center Electrode Material is Iridium Do Not Gap, Gap is Preset

Original Center Electrode and Ground Electrode Material is Platinum Do Not Gap, Gap is Preset

Gap 0.040in OE Type ; Plug Type RS12WMPB4

Gap 0.050 O.E. Recommended Double Platinum Plug - Extra Long Life Double Platinum Plug with Platinum Ground Strap

Gap 0.040"

Gap .040 (in)

Gap 0.040 DENSO is O.E. Manufacturer / Iridium Long Life Plug - Patented Iridium Alloy Plug (90% Ir) with Platinum Ground Strap OE

Gap 0.044 Iridium Power - Performance Upgrade with World's Smallest Center Electrode (0.4 mm Dia.) & Tapered Tip Patented U-Groove Design & Patented Ir Alloy (90% Ir)

Gap 0.040"

Gap 0.040" OE Equivalent Design 100,000 mi OE Mfr Recommended Service Interval

Gap 0.040 Iridium TT - Ultimate Endurance and Power, 0.4mm Iridium and 0.7mm Platinum Twin-Tip Technology

Gap .040 (in)

Gap 0.040"

14mm Thread; .708 in. Reach; Heat Range 6; 4 Pack;0.060 in. Plug Gap

14mm Thread; .708 in. Reach; Heat Range 6; 8 Pack;0.060 in. Plug Gap