Author Topic: O R and S radiator tag letters  (Read 377 times)

My68SS

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O R and S radiator tag letters
« on: May 11, 2016, 05:56:20 PM »
I see that these extra letters are still something of a mystery.
Just one question, what has been the observed usage of these letters? e.g. which letter is most often seen, or is it an even split - no bias in usage?
Rob
1968 12C SS
L34/M40
12 bolt posi 3.55