4.3L blower at 6psi boost, on top of a high compression 8.4L V10, should likely make 900 hp (800 rwhp) without much issue.
Paxton on a stock Gen 3 at kit level low boost = adds 200 rwhp
Even my 2.3L Magnacharger on the 7.0L Z06 added 170 rwhp at 6psi. Tiny blower, smaller engine.
Just examples. I would think a 4.3L blower would easily add 250 rwhp at 6psi.
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