Quote:
Originally Posted by car4jim
...a 427 FE that looked relatively stock.
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I have a 400HP 289 that
looks completely stock. I purposely built it that way, along with the '68 Mustang that
looks completely stock until you start peeking deep into the corners.
My point here is that anecdotal evidence isn't, and "pretty close to stock" isn't, either. I've no doubt there are scads of 427s around that would dyno at 500HP... but not if they're 100% era-original. Most claims like the one you're referencing end with, "Oh yeah, we ported the heads and tooled them out for 2.14 valves" or "Oh yeah, we used a steel crank with a little more throw" or other "Oh yeahs" that negate "original."
Don't get me wrong, I'd be happy to be proven incorrect here. Name any production engine from the 1960s with more than 1.1 HP per cube *in original, unmodified form* - blueprinted is fine, but not modified. I can't think of a one.