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I have a 71 ss454,the build date on the block is b-12-71,suffix code is to414cpd 11l1358---- cant make out the rest. Casting number is 3963512, the 396 is cast but the 3512 is stamped its been ground off and stamped on. Whats the deal ,has anyone seen this before?
 

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Yes plenty of times there is even a picture of one in Chevrolet by the Numbers !!! My All Original 70 LS5 had the same thing the last 4 the 3512 hand stamped in .

Jim
 
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