Quote:
Originally Posted by _Nick_
The 392 is underrated at 470/470. I've seen dyno charts that would suggest they make a bit over 500.
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I believe Fiat uses the same SAE procedure for HP that GM does and the rest of the industry. So "under rated" doesn't mean what it did years ago.
You may see engines that make more than that number, just like you do with LS3s and likely will with the LT1, but the standardized SAE procedure, which is a witnessed test, pretty much prevents over and under rating an engine.