01-09-2025, 09:40 PM

1950Mercury 1950Mercury is offline

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Join Date: Dec 2023

Posts: 87

1968 400 engine

I have my eye on a 68 400 motor cast 9790071. I have heard that sometime during the 68 year they started drilling these blocks for 4 bolt mains. Does any one know if this is true and if so when did they start. I heard it was they didn't have to have 2 casting numbers. This block date is March 26 68

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