Go to the Owners Forum, Nordic section. Look at the posts from the past 60 days, there's some info there. To answer your question in brief, yes it will handle a 500EFI and a whole lot more very well. I run mine in Long Island Sound and it does well. If you need specific info on how it's built (stringers, glass, etc.) let me know, I've been to the factory several times and had mine apart while I was making some mods. 500EFI will get you an honest 70-72.