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1963 421 Block Help

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06-24-2026, 10:26 PM

1963cat

1963cat is offline

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Join Date: May 2023

Location: Muskegon MI

Posts: 4

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its a 4 bolt main and looks to be large main and rf corner near deck looks to be 421 i would say. I will check casting number on mine to be sure but looks to be 421..

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