I have and know guys w street strip cars that have spun rod bearings w/ high volume and a stock pan on there 340. In fact my buddies purple haze 70 duster had 12 diff 340s in it until oiling mods and bigger pans were used. Blowing them 340s up left and right back in the 80s. Big cams, HV oil pump, and high rpms. Rod bearings flying everywhere. Not sure if it all depends on rpms or not. Was spinning my fresh 340 up to 7500 under hard accel when my oil pressure dropped and #5 rod bearing spun. Im sure just a simple baffle, or limiting my rpms would have possibly prevented this. All I can think is oil was towards back of pan and possibly aerated quite a bit. I no longer chance it, I now do oiling mods and run a Kevko pan and have had no issues. One spun bearing was enough to prove to me the L/A oiling system is not good for high rpms.