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Now that we've got you good and primed, we thought we'd show two very important identifying characteristics on the Northstar. First, look for a round boss cast on the pan rail; it denotes engine size (why didn't manufacturers do this sooner?). The big cheese: the 4.6. While the Oldsmobile Aurora is basically the same motor, it comes in at 4L and features smaller cylinder head components. The boss indicates it.