The casting numbers are 5463636 and 5463637 and my understanding is they came on 1969 and early 1970 Chevelles, Camaro, Novas and over onto the other GM makes as well. I have inspected several LS6 Chevelles with these calipers so they must have been using them late into 1969. I unfortunately never documented the cut off period so I am not sure when they changed over to the 700/701.
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