The vin on the radiator core support only has 6 numbers, is this normal?

There are also other numbers stamped that have nothing to do with the VIN. Those are usually easily feel able, the VIN stampings are never pronounced enough to feel them from underneath. You almost always have to scrape paint to see the numbers, For sure one the trunk lip, you have to remove the weatherstrip and scrape the glue and paint to see them. On the core support they are usually under the yellow coolant decal...