Question/Comment: I am trying to verify my block as being original, my block has been decked, in your information it says it can be retrieved...how? all the other numbers and dates look to be original. my car is a 1968 SS 396 4 speed convertible, with a build date 01A, by the oil filter it has "Hi Perf Pass" K 14 , and on the drivers side top of the block it has 3883948, more towards the middle it has GM3 conv 2 K ?? 7

 

I had a similar question and got the answer at www.nastyz28.com. The casting numbers will be able to tell the size and if it was in a z28, ss or whatever.