Spark plugs for Offy's

G

Graham 37

Junior Member
I am fitting a new pair of Offenhauser heads to my engine and I am having great difficulty sourcing correct fitting plugs locally(Queensland Australia).
I have surfed the Net and it is proving of little benefit.
Is there a plug that will screw straight in without modification to the heads and also 'bottom-out' flush.If I use the Champion H10 they will be short by a few threads,which I believe is unacceptable.
Anyone??
Ol'Ron??
Rumbleseat??
Part numbers and a supplier would be good.

Thanks,

Graham.
 
Try a forum search: spark plugs offy heads, there is a post by walt dupont with several autolite suggestions
 
I just installed a new set of Offy 400 heads. I used Autolite 414 plugs. There 1/2in. reach, not extened tips, same heat range as H-10. Perfect fit. Walt
 
Thanks to everyone.
Where can I buy them?I'll need a supplier that will send overseas(Australia)

Thanks again,

Graham.
 
Graham, If you find what plug you need but unable to ship to Australia let me know where to buy them here in the US and I will ship them to you if that will help.
Best of luck, Mark
one4dford@yahoo.com
 
NGK B6L You may have to grind out a thread or two to prevent a hot spot, same as for a Champion plug.
 
Ole Don, please elaborate on that procedure for a not so brite bulb like me. Are you talking about chamfering the bottom threads?
 
The NGK GR 2635 spark plug has an 11/16 ' reach with the washer. I use them on my MCF flathead heads. Perhaps they are long enough for Offy's.
 
Thanks everyone for your good info.
After looking through a lot of parts books for equivalents, we found the answer only a mile away. NGK B6HS, 1/2 inch reach, same heat range as H10 they tell us. She runs like a sewing machine. It's a 99A in a 37 Fordor.
The heads were a gift to me from my son Gavin, for Christmas. Thanks to him we are a bit Model T mad also. He has a beautiful 26 roadster, an original car restored, and we're half way through a 27 roadster ute for him. Some other ideas in there too, a warm 8BA in a 27 ute rod, and a speedster for me. We'll see.
Thanks, Graham
 
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