It has a huge displacement advantage but is a 10 year old motor. Respectable on both ends.
An lt7 would be a beast. I would think 550hp should be doable under emission constraints etc. And that would be plenty.
These are good numbers for the ls7. Haven't looked a whole lot lately but it seems I remember a lot of them being 440-450 rwhp stock when the c6z came out.
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