I've got a knock coming from #1. It goes away if I pull #1 wire off. I'm not on the road yet so this is just running it in the driveway. Pressing my fingers to the underside of the pan quiets it down but I can still hear it and feel it too. I'm thinking my next step is to pull the pan to get a better view. Not sure if I can see up to the underside of the piston to see any cracks. If I don't see anything obvious then I'm going to pop #1 journal and see if that shows anything. Any suggestions?

Dennis


40 Chevy 1/2 ton