My buddy has a VERY Hot 340 with a BIG Hydraulic Flat Tappet Cam in it. .620 Lift 252ish duration. He does not drive it that often. It will sit 3-4 weeks at a time before he will fire it off sometimes. Man it sounds like the motor is gunna come apart until the Lifters pump back up. This is all normal stuff with Hydraulic Lifters.
