The motor is at the machine shop getting checked for cracks etc right now,and has never yet been apart . I was told this was bought over the counter by the person i got it froms friend,and he bought it new from gm to put in a 64 corvette,which is what it was pulled from Alternatively, it could have been a assemby line motor that never got stamped. My white Z has a trans with no vin, the date matches the POP, an the original owner said it was never touched It is actually a May 29 not may 26 as listed