Anyone experienced a cold rod bearing knock from their Vortec engine? I was bored at work today(very very slow) and started looking up all the service info on my daily driver since it has a few issues. One of them is when it is really cold it has a rod knock at low rpms. There is a TSB for that exact thing, a cold, low rpm rod knock. Recommends new rod bearings. Also stated that some of the Vortec engines have a problem with crank bearings. Anyone tell me how to tell if my rig is affected by the crank issue other than pulling the oil pan? And anyone dealt with the rod knock thing? I was kind of figuring if the engine has to come out I might as well slap together another one so all I have to do is pull the intake and wiring assembly and throw in a fresh, maybe more powerful engine.