400 Block
I have just purchased a 78 T/A with a 400 engine and noticed on the top of the block when you take off the valley pan, the letters X X. On others like 455 it has 5 5 and 400's it has 0 0, any idea what XX is , the car is numbers matching so its not a replacement? thanks
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1972 Formula 400 auto.Lucerne Blue/Ivory Int.R Console. Numbers matching. Now Sold. 
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