Q: A loud noise is coming from my engine

it sounds like a bolt inside the engine, it is a very random noise not a constant timed sound, the transmission is a t56, and the flywheel was just replace with all new bolts. the pilot bearing was also just replaced, the engine just had a new cam, and new springs put in, i took the valve covers off and ran the engine and everything looks fine, i took the intake manifold off and the valves all look good from what i can tell. it sounds like a broken connecting rod, but the rods looked good when i took the oil pan off, and the engine has not been revved over 2500 since being in the car, just idled to move the car. so i don't see how the rod could have broke. i will have to pull the engine to check the bottom end so just wanted to see if anyone had any ideas. the noise is very loud and i don't want to run the motor and cause more damage. i also checked the starter and it seems like it is working properly not staying open and hitting the flex plate. i am at a lose at this poin