Gascolator

A Canadian Maintenance disclaimer is a good idea.
As to spark plugs. The Ercoupe originally had short plugs and
no eyebrows. My 415C has no eyebrows and I wish to keep it that way.
Don't know what plugs were original to the 75hp. Surely there is a plug
that can be cross-referenced to it or a reasonable USA alternative to the
overpriced Champion M41E.
Anyone?

I have suggested that when he posts here, he makes a disclaimer that he is operating under a Canadian owner Maintenance program, similar to experimental, and what he can do with his aircraft would not be acceptable here in the states without a STC or a 337.

What he refuses to say is he is in Canada, and the Ercoupe is under owner Maintenace, almost like experimental, what he can do with his Ercoupe would get yours grounded by the FAA.

Did you get an STC with those plugs, or what?

I think they are autolite389 will have to check next time I am out at my plane

The Champion M41E spark plug price has increased to an insane $120 per plug. What 18 mm tractor plug are you using?