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Originally Posted by profi
a holden supercar engine is just a small block chev which has descended from a 350 and the aurora is just the code name holden have named the engine.
hope this helps you out
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Not quite right.
Holden rebranded the name from (its internal designation) 'Aurora' to HMS. It has heads/cylinders that do away with the previous GM siamesed bore configuration and is similar to the evenly spaced Ford unit in that regard.
The (Olds) Aurora engine is an entirely different configuration. DOHC 4.0 V8, which was raced in Indycar. The two engines should not be confused.