[Kurt S]

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I would have thought those later built Camaros recieved a three letter suffix,as the Chevelles did.
Anyone know why they didn't?

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I'd guess cause it was a model year extension and they chose not to change the codes midyear (though it's not really changing them, just adding a digit...).
I've heard of 2 Camaro blocks with the 3 letter code, never seen them.