Hi Scotty.
I have a 2007 subaru legacy 2.5 non-turbo that the engine was just rebuilt. My son and I had just finished installing the engine on the car. We started the engine to break the engine in and check for leaks. At idle the engine runs smooth. When we accelerate between 1800 -2000 rpm, we get a tapping sound. What is causing the tapping and What should we look for ?

check valve adjustments first, pray it's not rod knocking. Make a video, post it here, I will analyze that