champ s.plug RV12YC6 for what?

[crazy charlie]

help me out here guys.I bought these plugs a while back and cant remember what they are for.Champ RV12YC6 .I have only owned v8 mercruisers and evinrude outboards.Anyone can tell me what these plugs are for ????Charlie

 

[WillyBWright]

Re: champ s.plug RV12YC6 for what?

That would be for certain GM V-8s.