Did you pull both heads?
Did you try turning over the crank with the heads off.
If a valve was contacting a piston you would see either a bent valve and/or hole in piston. With both heads off the crank would turn fine.
If you threw a rod you can't see it unless it poked a hole in the side of the block. A broken connecting rod will give you the problem you're having of not being able to turn the crank past a certain point in either direction.
The engine is still under warranty, if OP goes pulling heads off, engine builder can rightly refuse warranty. Best thing is to just package it all up and send it back.
I'm awaiting the call from engine builder...now from the pictures I've posted of valves and sparkplugs in your opinions would lean for short period of time cause this to lock up...I just want to cover my bases
It's unlikely a lean condition would cause the sort of thing you're reporting. Lean would burn valves mostly, not something that would stop it turning.
Without know what's causing the lock up, it's really difficult for anyone to make a call. Best get the engine builder to open it up and report to you what they find. Ask them to video as they are getting into it (or allow you to be present when they do)...
Chris.....
