12 mm Spark Plugs."R" Heads.

[9SECVSIX]

Can someone suggest a good 12mm plug for the "R" heads. Street motor with Alky, use to use Autolite 104.
Thanks
9sec.

 

[WhiteTtype989]

Alot run the autolite 103s

 

[vacuum 6]

Why you want to change?

I like the 104s over 103s.

 

[9SECVSIX]

Why you want to change?

I like the 104s over 103s.

I guess I didn't make myself clear...I use to use 104's in the 14mm plugs. I didn't know a 104 was avaiable in a 12mm plug. Are you aware that late GN1 "R" heads use a 12mm plug not a 14mm?
thanks
9sec.

 

[larry33kc]

Search in my post. I asked this awhile back but cant remember what they where and I am not at home to look

 

[9SECVSIX]

Sounds like our only option is the AR 4132 .I suspect it's a bitter cold racing plug
Thanks for the reply larry.

 

[larry33kc]

Hey no problem, its funny I just brought a plug up to tell you the # but you beat me to it. That plug is what was recomended by Champion.

 

[9SECVSIX]

Hey no problem, its funny I just brought a plug up to tell you the # but you beat me to it. That plug is what was recomended by Champion.

Do you consider that plug OK for a street car running 91 and Alky?
Thanks

 

[larry33kc]

Don't have enough time in it to give an opinon