Observations and Thoughts
First, It doesn't sound like a "death rattle" of a blown engine or failed part.
Noise appears to be happening with every crank revolutuon.
Noise hasn't changed since first fire up.
Last video it sounds like you can hear the noise right when the engine stops.
Only a couple of things I can think of right now. AND I MEAN THINKING ONLY. Screw or something went down the intake and is stuck in the top of a piston. That could be checked by sticking one of those little cameras in the sparkplug holes.
That noise, shallow but deep. I've heard something like it before on an Olds engine. That engine got water in a cylinder and bent a rod. Just enough to let a counter weight contact the bottom of a piston. This makes me wonder what rods got used in this build. Remembering that thread a while back where the little end of an aftermarket forged rod was touching a counter weight.
Really hard to say from watching videos.
Sorry about first thoughts being worst first this morning.
Clay
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All the federales say,they could've had him any day
They only let him slip away, out of kindness...I suppose
Poncho & Lefty
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