R Pony Plugs

[JimnhR]

Is there a modern replacement (thread, heat range, and reach) for the original Champion 6COM Spark Plugs specified for the "R" Pony engine in the Service Manual?

 

[buickanddeere]

Autolite 437 if it's 14mm thread.

 

[JimnhR]

They are 18mm(2 cyl pony). It currently has Autolite 386 plugs but they appear to be resistor plugs which I understand don"t work as well. I"m also trying to duplicate the "correct" heat range as close as possible-I"ve replaced quite a few snowmobile pistons with a hole in the top from too hot plugs and I don"t want to do that to my pony. Perhaps NOS 6COM are the only safe choice but I wanted to first get recomendations from any of the "R" experts in the forum
Thank you

 

[buickanddeere]

Autolite 3116 are the charm in an 18mm application.
I'm not much of a Ford fan but their Autolite division does make the best spark plugs on the market.

 

[JimnhR]

Thank you for the help