I also agree with nixwebo and Lisa. I don't think the search engines care about the text size. The search engine is after the structure/organization of the page components, not what it looks like.
This is a very minor point, however, but for the human visitor, I think a heading that stands out may help people stay on your page longer... which the engines take note of. So, in a way, there is a very tenuous link between h1 tag size and search engines result. Hope it makes sense.
Sherif
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