NGK UR5 stock number 2771 spark plug question?

[TA49-WE4]

Is a NGK UR5 stock number 2771 spark plug the same heat range as a autolite 23 spark plug?

Is there a NGK spark plug that is the same heat range as a autolite 23 that does not have the v cut in the end of it?

It looks like the v cut in the end of the spark plug would just add to the spark plug gap in the center and increase the odds of a miss fire at high boost?

Thanks

 

[stangbangin69]

yes, they are the same heat range as the autolite 23's.
i had to gap my ur5's down to .032 to keep from having a slight misfire.
i'll look into the solid electrode ngk plug. don't know if they make one or not. maybe look into a "g-power" plug instead of the "v-power"

 

[turbojd]

I have the NGK UR 5's V groove plugs in my GN now gapped at .032 with no problems at all. I've read different articles where the UR 5's are the same heat range as an Autolite 23 and an Autolite 24.

 

[8UWITH6]

Ran the 2771's for years in all my cars, no problems, tight .030 gap