valve chatter 360 magnum

Your oil pressure is too low for my liking. 10psi might be the cause of excessive noise too. I have a mopar crate 402 and the valve train isn’t quiet, but not crazy loud either. I have 80 psi cold, 30 psi hot idling in gear, and it increases throughout the range up to 65-70psi at high rpm…

If you have a magnum you have a roller cam and you don’t need Lucas high zinc oil either, but it won’t hurt.