I don't post much but I do spend several hours a day reading the post. Just about a week ago I noticed a louder than usual knock coming from 6.2. I couldn't hear inside the Blazer but outside it was pretty loud. So I went searching, I thought it was a rod knocking at first, but after pulling the oil pan, I noticed there were several pieces that looked like a part of the piston. Sure enough it was part of the the second piston back on the passenger side. I plan to pull the intake manifold and head next week and try to replace the piston. Hopefully this will cure my problem. I know I should pull the engine and rebuild, but this is my daily driver. The good news though, is that I have managed to complete the build on the rear bumper. I still lack the tire carrier and basket to carry my fuel and water cans. The front bumper is almost finished except for pipe bending and etc. All the work is being done by my Agricultural Mechanics class at the high school were I teach. Free metal, free labor, a place to work in the warm and a big plus is that my students are getting experience in welding, geometry, and hands on experience.