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Hi , Need some info on a big block tall deck block casting number is 473478 and i have stamped number of TA26XXY7 can some decode this for me. Thanks very much
 

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473478 is a 68-84 427 tall deck block.
Get the casting date from the rear of the block opposite of where the casting number is.
Not sure if your posting the partial VIN or the engine code overstamped.
Can you post a pic of the stamping?
See if the last digit of the stamping (the 7) is actually a letter.
 
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