Quicksilver 8M0194134 AC Spark Plug 41-983Quicksilver spark plug made by AC Delco For MerCruiser 496 Mag & HO and MIEProduct Features Made by AC Delco with nickel alloy tip, copper core and ribbed suppressor seal for durability and performance; Check your engine owner's manual for the correct spark plug and use only the plug as recommended by your engine's original equipment manufacturer; Don't just clean used spark plugs, replace them with new plugs for better performance; Application: Fits MCM 496 Mag & HO and MIE 8.1L & HO Supersedes Quicksilver 8M0129146