I can not seam to find any numbers on the rough pad near the oil filter where it should be my Z28 is a norwood car with a build of 2nd week in August 1969. My DZ motor build is May 29th Casting date for block is May 25th, heads casting dates are May 26th. All previous owners have stated the motor is original espec. the original owner. I have talked to them all. The V0529 DZ cade looks original with no partial vin stamped by it , but there are 5 large numbers 01877 that are stamped off to the left. I was told they are the engine's first rebuild date done at the machine shop. Jan 8th 1977??? These numbers are larger and not even like the factory V0529 DZ stampings. I know the oil filter location is hard to see, maybe factory did not stamp vin on this one?? Any tricks to seeing them???