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nailhead_sled
02-19-2003, 12:16 AM
Ok, so I'm getting tired of searching for the ever dwindling supply of AC44 plugs. After arguing with the kid at the local parts store about the existince of a 322ci motor (man, what do they teach kids in auto shop these days..they know about nothing but SBC's) and finally just "borrowing" the appropriate page of their cross reference manual I noticed that it listed several alternatives:
ACR43, ACR43S as well as Champion 58S.

So my question is this- Whats the difference in these plugs, is it heat range only? Or is there something that would prohibit me from using them

The Old Guy
02-19-2003, 08:29 AM
The AC 43 and 43S are one heat range colder, and the S stands for extended tip. If the 43S will clear the piston top, it would be the best choice.