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I'm in middle of rebuilding a 1998 4.6..I've been a mechanic for over 40 years,buy I haven't ran across this .after tearing the engine down I noticed it has 4 connecting rods of one kind and 4 of another..this engine has never been taken apart..as I didn't mark them when I took them out..I don't know if they were arranged a certain way or what?.has anyone seen or heard of this?.4 are narrow rounded,and machined well,the others are wider,beefier,and rougher cast..I'm posting a couple pics showing the difference..if anyone knows anything, I'd appreciate it..thank you very much