I have seen other SR 63 blocks stamped similarly, I attached the casting number and date code, they all make sense to me
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Originally Posted by PontiacJim1959
Interesting, an SR block. I didn't think Pontiac used the "SR" designation until after 1967. My brother has a 1967 Pontiac 400 service replacment block and from my research, 1967 and earlier won't have "SR." Photo enclosed. It only has a "P" for the Pontiac foundry.
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