I have a block ot text in a h1 tag. there are three separate paragraphs in this tag, and I want to indent each paragraph. Is there an html tag I can wrap around each paragrapgh to indent them?

Yes ...

thank you for gracing me with your informative answer.

You're welcome.

READ YOUR OWN POST!!! especially the bit I have put in bold

there are three separate paragraphs in this tag

You shouldn't be putting three paragraphs inside of an <h1> tag, but to indent something, you should use CSS:

CSS

p {
text-indent: .8em;
}

just an example...

Im using the H1 for SEO, why cant I pout three paragraphs in the tag? its all related to the same topic but for grammatical sense it is separated into three parts. I have a whole other topic in the h2 tag, and h3 tags....

Hx elements are for headings.
Doing dumb tricks like that will more likely have the OPPOSITE effect from what you are expecting.

AND IF Hx elements are used by search engines to pick out important words and phrases, HOW exactly can it pick out important ones if all the words are in headings??????

Use headings as they should be used NOT for some dumb SEO theory.