Uhh,
Buick actually did produce the 215 aluminum V8, and olds used it too as the "starfire". It was not a variant of the Nailhead at all, it was a very small block and had high revving capabilities with a short stroke. GM did sell the design to Rover, who copied it verbatim and then started modifying it. I've seen a couple of Jeeps with this engine swapped into it.
