[Gunner]

I don't mean to be a PITA but I am really having trouble believing claims of 500HP for an essentially stock SO. My rule of thumb, based on decades of devouring car stats and claims and some practical experience, is that 60s tech is good for 1 to 1.1 HP per cubic inch, with power in a reasonable band and some street driveability. I can't think of any exceptions, even allowing for manufacturer under-rating.

If anyone has a documented original-build 427SO with more than about 430HP, or an otherwise original-build SO with a modern cam profile making more than about 465HP, I'd love to see verifiable results. I maintain that more power is not possible without post-era modifications, displacement increase, modified heads, etc.