Confirmation of correct spark plug

[Richard Kal]

....for a 1927 Model A.

Can someone please advise the part no (and heat range).

Hoping this contact will spark a reponse and someone can give me a lead; it will cap off my day!

Thanks,
Richard

[nevhunter]

Not easy to get 18 mm plugs here. I use Champion D-16, or the next colder one if working harder. Nev