3414 spark plugs

beck55

Member
Anyone out there know the correct spark plug for an old 3414 with a British made gasoline 4 cylinder? It currently has Autolite 216 but I suspect this may not be the right plug. I've got the original service manual but the only reference to the plugs is about cleaning them every few hundred hours. Thanks for any help/advice!
 
With a compression ratio of 6.3 to 1, AC 386 spark plugs should work fine. I have those in my Hs and Ms with a compression ratio of 6.0 to 1.
 

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