GMC Sierra 2500 HD Classic Spark Plug Replacement

Gap 0.040in; Plug Type RS12YC

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 0.060"

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

w/ Platinum Design

Gap .040 (in)

Gap 0.060in; Plug Type RS14PMPB5

Gap 0.040in; Plug Type RS14PMP4

Original Center 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 Material is Platinum Do Not Gap, Gap is Preset

Gap 0.040in OE Type ; Plug Type RS12WMPB4

Gap 0.060"

Gap 0.040"

Gap 0.060in; Plug Type RS14WLPB5

OE Style

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

Gap 0.060" OE Equivalent Design 100,000 mi OE Mfr Recommended Service Interval

Gap 0.040"

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"

w/ Platinum Design

w/ Platinum Design

w/ Platinum Design

Single; Plug Type 1IR5L; 14 mm. Thread; 0.6910 Reach