Re: AC-R43 Spark Plugs (8)
Scott
The plug with all 4 same sized THIN green rings is the one that was used on the assembly line,and most desired.
These R43T shown as an example were for LS-5,L-78 & LS-6 engines.
R43 would look similar.
Yours have the single fatter top ring & are much more common as they are later issued service replacements.
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