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links don't work........
I don't hear a deep knocking from the engine either. Some of the clips I couldn't hear anything abnormal. I don't think that we could hear on video what you are hearing up close. I wasn't sure that we would be able to though. The ne from underneath seems to have the most noise to it.
I agree with stew grif, burn it out, then start fresh with a new crate 350. $1200, no interest, no tax, free shipping. I got my engine one year ago this month. I just paid it off yesterday. Not one penny interest. Haha, jokes on summit. (Not really, the house always wins)
Curious to know if the dust cover has been dropped yet and t/c slid back and motor ran. If you are sure you have no exhaust leaks and it has not been done yet, then that is the next logical step along with the other steps outlined by BD and VZ referencing the power balance test.