I wonder if it didn't have something to do with marketing too. I don't recall seeing Keystones available in the Mpls/St Paul area much until the mid seventies and by then most of the cars around here had Cragars ?? Kinda like the first car or other "first" events. We tend to stick with what we first found attractive.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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