I could be wrong, but I think stock & mod is more a term from the past when you'd have a stock motor that was say a 27 turn & wasn't able to be taken fully apart for cleaning & skimming & modified motors that were of any wind & could be taken apart.
I think stock now refers to spec motors where you'll have a 13.5 limit for example, modifieds are no limit.
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Model Junction, Boughton Raceway.
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