360 /380 hp crate engine noisy valve train

Just wondering I recently installed a very low mileage 360/380 hp crate motor. It runs good no problems but the valve train is noisy like a small solid cam. I'm just curious if there are issues I should no about if this is common. I had a 300 hp crate and it made some noise on start up but went away. Mostly from sitting a day or more but this one is still some what noisy even when warm.