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I have a 327 that is 60 over with flat top pistons and comp cams xe268 cam. What plug should I use? AC R45 or R45S? The S plug will go farther into the combustion chamber but I do not know if that is a good thing or not. Also what should the gap be with a MSD Ready to Run Distributor.
Pat
 

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I google A/C spark plug diferent between R45 and R45S and came up with alot
of stuff. seems most of them like using the S . As far as the gap I do .035
 
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