All rod bolt's not torqued ?
Im not buying it.
Besides,you buy a short block I would think you might actually go over any and all bolts before you finish the assembly -
You added the oil pump I assume,maybe a windage tray ?
Dont you own a torque wrench? Dont you check your own ad on's ?
So why would you not check the whole motor ?
Maybe the rods were defective,maybe the bolts were tight but the rod was preventing the bolt from clamping fully,sorta like when you tighten a bolt thats too long for the hole...
Bash the guy all you want,you get what you pay for and you bought the cheapest engine you could find,Dynoflo good bad or otherwise is an internet low cost builder - maybe it was hand tight or maybe not
but I see it as operator error -you failed to finish the assembly like a professional, live and learn then move foward.