Max lift on stock guides and seals?

That's why I was curious. Maybe it depends on the head? Maybe not even the number, but actually the particular head. Hughes calls caution on anything above .450" on their website, but on other pages of their site, reference .500"

The heads that I'm checking are a 302 and seem to have somewhere just over .500"

I have a few different vintage heads that I'd like to check and see where it makes any difference.