Ummm.. not reusable.. unless you meant on the exact same head and header..
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Yes, I have removed and re-installed my header more times that I can remember and re-used the gasket without problem, can't say the same about the gasket that came in my gasket rebuild kit, or a felpro one I used after that. They are 1/8th thick I believe, crush 50% and spring back 30% they say, I would be confident in using it on another engine or header as well but have not tried it.
