I'm finishing a head gasket replacement on a 77 750A and have one piece left over and I don't where it came from. It's applears to be an aluminum oil orifice that sprays oil for lubrication. It's got an outside diameter of about a quarter inch and is maybe a half inch long. It narrows from about a quarter inch to a sixteenth of an inch with small orifices on the narrower portion. I believe is came out of the cam tower. Any help is greatly appreciated. Thanks in advance.