496HO Plug recommendation
 

Hello All,

What plugs do we recommend for Merc 496HOs? Looking to do a tune up.

Thanks

I’ve ran ngk tr55ix as a great substitute to the stock acdelco plug. I currently run ngk tr6 as a step colder option but I have a modified N/A application in my Baja.

Thanks - mine are bone stock so perhaps I should stick with what merc suggests. Thought perhaps things had changed over last 10 years. ;-)