Quoted from 69 Camaro FAQ's
"Engine Partial VIN stamping:
Some Van Nuys-built (LOS/VN) cars had the VIN stamped on the pad of the block and some had the VIN stamped down by the oil filter. Sometime in October of 1968, we believe the stamp was moved to the oil filter, but by sometime around February of 1969 we believe the stamp moved back up to the pad."
I own block V0109DZ which came out of 19L518297. I've deduced that this car's build date was approximately 01C, 9th day of production for Jan '69, Jan 12th?, and the partial vin was stamped on the front pad next to the DZ stamp.