Spark Plugs

Hi Paul,

If yr engine is a short block SB302 , then use
Autolite AR3934 (hotter)
AR3933 (colder).

I use them for years on street and track and they do fine.


Grtz
Fred
 

Steve

Supporter
Agree with Fred. I use the AR3933 with 10.5:1 compression and pump gas. If you're using higher compression the AR3934 would be better.
 
Thanks guys will have to get them from the states , another question the Threadreach: is 11.2mm on the NGK plugs the Autolite AR3934 are longer will this matter
 
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