I don't recall exact dates but I believe RAI was the only one initially available and was a D-port head casting #31. In May of 68, you could get the RAII which was the round port head. Forget the casting number on those...722? For some reason I think the RAII replaced the RAI, but not sure about that.
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SOLD 1969 427 COPO Camaro Lemans Blue/Black, M22 4 speed, 15,800 original miles
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