Quote:
Originally Posted by Dave-ROR
They do provide tweaked examples. Been common for.. ever. But it won't be a tweaked example making that much power. Not really possible without a lot of engine airflow modifications which should have been very obvious.
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Right, it's described in depth at the Corvette forum. Consensus, FWIW, seems to be that the SAE methodology is conservative compared to the methods of magazine testers with variation in dyno calibration accounting for the difference.
I guess the ZL1 tweaks, if any, didn't do much. Most owners duplicate or better Chevy claims.