I recently tore motor down to check all internals all looked good replaced all bearings and put it all back together. I primed it up 40pounds to back of block but never got oil to rocker arms but was in valley. I crunk it this week for the first time and fired right up still have to adjust the valves a little. so I got it to idle so I could start adjusting everything but I heard a knock from the bottom end and I still wasn't getting oil to rocker arms. when it was running the first couple of times it sounded good nothing wrong besides a few rockers ticking where they needed to be adjusted. but last night it just started a knock sounded like from the bottom end and it only has been run 4 times no more than five minutes. i don't want to tear all the way apart just wondering if anyone had any ideas