AC Delco Spark Plug 41-104Sold individually. the ACDelco 41 104 is an ACDelco GM iridium spark plug commonly used in GM based marine engines most notably Indmar engines and some Ilmor specified plugs (Ilmors KT5505 is the same OEM plug). Indmar (GM based inboard engines) Indmar lists the 41 104 (or its ACDelco GM equivalent) as a service spark plug for certain LSA GM derived marine V8 engines. If you have an Indmar 5. 0 5. 7 6. 2 family engine, 41 104 (or closely related

Please note lights are sold individually

The knock sensor controls the advance on your ignition timing

Width: 3/4" inch

Make sure to install with arrow pointing in flow of direction

0L engines model 2020 and newer

premium oil-based grease that is enhanced with extreme pressure additives

Indmar Chevy 5

Iridium spark plug

Minimal Bulk Design

Construction & Materials:

High-Contrast Colors For Easy Visibility In The Water

+ 1” Diameter fill and drain ports