How To I.D. a Merc Flathead

[RalphG]

Originally Posted by RalphM

He might mean “Mercury “on the heads.

I’ve had younger folks look at my flatheads and wonder why a six cylinder has eight spark plugs.

Yes, I just heard back and he says that Mercury is on the heads. Was that a U.S. Mercury thing? All the Merc engines I've seen here are EAC made in Canada on the heads.