Block is 3914678, crank is 3279, there is O's on the rods, there is no #'s stamped into the block & I don't understand why because the motor has never been rebuilt, has standard bearings throughout & standard bore, I'm assuming it was decked but why nothing else? The story I got was it was a crate motor never assigned to a vehicle, which I personally think is BS. I had it on ebay & was completely scammed & don't want to do it again, it was recommended that I ask on this site for assistance.