1999 C2500 Vortec 5.7 Rod Knock
Great info here, except the flaming.
I have a '99 C2500 with the 5.7 vortec and this is what the story is. I had an intake manifold gasket go out and it put water in the oil. The truck sat for 4 months and I forgot to drain the oil and flush the oil system, " I know not good " I finally replaced the gaskets. I then had an injector issue ( missing on one cylinder ) replaced it with an updated spider. However before replacing the spider I was trying to go on the cheap and put injector cleaner in the tank and ran about 50 miles with no improvement. I hate to admit this, but I revved the engine pretty high ( from what I read on this post, I probably over revved the engine. I immediately had a what sounds like a rod knock. The knock get quiter under load and noiser when you let off the throttle while driving. I think it is a rod knock. I'm planning on dropping the pan, removing the rod rearings one at a time and installing STANDARD BEARINGS, and using plasti gauge to see what the clearance is and replacing the bearings according to what I read. Do you think that is a viable option and what is the std rod bearing clearance on this engine.