Needing a little help

[RStewart]

Thanks Rawze. Yes, it was one of their O/O lease trucks. I bought it in 2018 from Kenworth. The truck had 406k on it but the reman was already in it. Interestingly, the head, turbo, and exhaust manifold were all new components when I bought it, or at least they looked new. The head and exhaust manifold were unpainted and the turbo didn't have any heat spots on it.

Other than that I have no history on the truck or engine.

According to what you found the engine was only a 400 hp engine, correct? Can this engine be turned up to 525 or 565?