Standard Spark Plug 14mm Thread, 9.5mm (3/8") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Non-Resistor, Removable Terminal Applications Include:

Spark Plug	Vehicle	Manufacturer	Engine
NGK-B7S	Inboard	MERCRUISER	Inboard 8 cyl GM Small Block 225 :  -
			Inboard 8 cyl GM Small Block 250 |2317201 to 2797056| :  -
			Inboard 8 cyl GM Small Block 270 |Gasket Seat| :  -
			Stern Drive 8 cyl Chevrolet Small Block 225 |To     2278646| :  -
			Stern Drive 8 cyl Chevrolet Small Block 250 |To     2639854| :  -
			Stern Drive 8 cyl Chevrolet Small Block 270 |Gasket Seat| :  -
	Outboard	MERCURY	100 hp 1000 : 1962 - 1964
			35 hp 350 :  - 1966
			50 hp 500 : 1965 - 1966
			65 hp 650 : 1963 - 1966
			80 hp 6-cyl. 800 : 1960 - 1961
			85 hp 6-cyl. 850 : 1962 - 1964
			90 hp 900 :  - 1965
	Snowmobile	O.M.C. - Snowmobile Engines	M227 :  -