[blykins]

Excessive clearance is what it sounds like....the main bearing clearance is more than it should be...causing the crank to walk up and down....So is that #1 bearing the one where the chunk came out of? Don't excessive bearing clearances cause spun bearings?

I would pull the engine, take pictures, and call this place and give them seven kinds. You shouldn't have to foot the bill for stupidity. Tell them to check bearing clearances with a micrometer and a bore gauge....not a tailor's tape measure. I'm getting fired up....should probably leave.