NAPA Auto Parts Genuine Parts Company
8 Fairfax St SE
Leesburg,  VA  20175
(703) 777-2055
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Store Hours
Mon-Fri:7:30 AM-7:00 PM
Sat:8:00 AM-5:00 PM
Sun:9:00 AM-5:00 PM
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ACDelco Gold Spark Plug

ACDelco Gold Spark Plug

Part #: AC M42K
Line: ACDelco

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Features & Benefits

Warranty: Standard : 12 Months or 12,000 Miles Whichever Occurs First


ACDelco Specialty Marine Spark Plugs are everyday replacement plugs designed for reliability and efficient performance in jet boats, inboards, outboards, and personal watercraft. They can maintain stable operating temperatures under varying loads. Their high-quality copper core and outstanding suppression characteristics deliver reliable performance.


Brand ACDelco
Spark Plug Thread Size 14 mm
Gap Size 0.029
Seat Type Gasket
Electrode Core Material Copper
Manufacturer Part Number M42K
Spark Plug Reach 9.5 mm
VMRS Code 033003005
Spark Plug Seat Type Flat
Spark Plug Hex Size 13/16 in.
Hex Size 13/16 in
Spark Plug Heat Range NGK2

Safety Information

Vehicle Fitment Guide

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