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Yes, i have a roller cam, otherwise i would never think of only running it for a few short seconds.
I have run several of engines without the manifolds headers hooked up without issue in the past.
I have headers, i just need to make the opening in the body larger.
I seriously doubt the garage would be consumed in flames, unless of course i had chemical or other gases leaching into it from something, but thanks for the word of caution.
Chris
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