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Re: Carbon monoxide
If you are feeling air coming from under the dash, you have an open hole in your firewall. In addition to checking the exhaust for leaks, I would also seal the hole or holes in the firewall. That way, if you do have a leak between the block and manifold, or between the manifold and downpipe, that gas is not making its way into the cab. Keep in mind that CO is odorless.
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