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My buddy has a 350sbc block number is 1066036and date code is 3m0323,Checked variuos sites cant seem to decode.Would like to find the date of build and year for the motor to order gaskets.Thanks all.
 

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10066036...350...........2 or 4...Target Master/Goodwrench crate motor, 2-piece rear seal "hecho en mexico"
That`s why it don`t decode. However, I don`t know they used other casting dates, the classic date code other than stamped on the head deck would be like this example: A 5 4 A = January 5 = 5th 4 = 1984.
This is usually found on the back of the block by the bellhousing.
This is a common small block replacement engine, it uses the same parts as the traditional pre 1986 small block chevy`s, as 1986 was the year chevy went to a 1 piece rear seal.
 
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