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That sounds a lot like a broken rocker, not sure what the equivalent is with an OHC engine, but that is a dead hole noise.
Thee is a chance it could just be the worlds most massive header leak, but with it making that much noise I would think it would almost be visibly puffing if it was.
Pull the valve cover and look around. I have a feeling the failure point will be rathr obvious if it is that loud.
-Tim
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