93 C3500, Crew, LB, Duals, F code with 141 Block. Replaced 90% under the hood this year.
That's what is so crazy. Bearings, everything under valve covers etc. is new, and that noise has not changed one iota. It's made that noise for 3 years, over the last 180 everything has been replace. No change at all, so what ever it is, it has not been replaced.