Fuel knock sound

[Lonestar10]

Leak down passes, sorry forgot to add around 250k on overhaul been chasing my tail a while, also rebuilt fuel pump about 30k ago, no visible air bubbles in davco... davco to hp pump I have no idea how to check. Banjos are tight no visible damage to oring washers.

Also my oil used to stay pretty clean almost like new with 15k oil changes now it isn't black but it's very dark.

My dad just had his 2350 overhauled start his truck with hood open you can still talk normally to someone where mine is a lot louder and idk how to explain but mechanicly louder, clangy idk how to say it his is 550/1850 proper tune.