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Spark Plugs

Center Electrode Core Material

Thread Reach (in)

Thread Reach (mm)

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ACDelco Iridium IP Spark Plug - 41-121
Part #:
41-121
Line:
ACD
7 Year Limited Warranty
Seat:   Gasket
Thread Size:   M14-1.25
Hex Size (mm):   16mm

ACDelco Iridium IP Spark Plug - 41-122
Part #:
41-122
Line:
ACD
7 Year Limited Warranty
Seat:   Gasket
Thread Size:   M14-1.25
Hex Size (mm):   16mm

ACDelco Iridium IP Spark Plug - 41-156
Part #:
41-156
Line:
ACD
7 Year Limited Warranty
Seat:   Tapered
Thread Size:   M12-1.25
Heat Range:   8