[Paul Huryk]

Originally Posted by zraffz

I'd bet on a stripped down engine dyno this combination could do 520 horses with a good tune. I have a tendency to think crank horsepower as fully dressed through mufflers and full accessories like how new cars are rated. I don't doubt this is a 460-480 hp motor with that rating.

I'll re-read the article tomorrow to see if the accessories were attached. You must be thinking about the 60's and early 70's factory ratings that were without any accessories and fully tuned - production cars rated at 300hp ran more like 225 on the street...