how do i change the stove box gasket on my 225?

Remove the manifolds from the engine and and unbolt them from each other.

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Joshua

Get one of the Australian or Remflex gaskets, they seal way better than the stamped steel gasket.

See the SL6 manifold installtion article for tips on how to prep and re-assemble the manifold set.
DD

HERE is the slant six manifold installation article.

Here are a couple of good threads about gaskets:

http://tinyurl.com/6lqjcs

http://tinyurl.com/68wgku

You may also want brass nuts - Dorman Part # 680-001 or 849-001 (same nut, sold to stores in different packages)

And new studs (Grade-eight) - Dorman Part # 675-093

And new castellated nuts for the end studs Part #AN310-5 (5/16-24) at this website

Danny