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No, no clutch in a HMMWV. But thousands of engines from these trucks were sold as surplus. Who knows what they ended up in or might end up in. Someone searching 5 years from now for information about the valley drain might happen upon this thread. With the older engines valley drain fuel...

I can look at the blocks in my class next week. But, somewhere around 1992-1994 when they changed over to the 6.5. The drain went from the small hole at the back with no tube to the bigger hole with the tube. I like the tube because it puts oil, coolant or fuel leaking over to the side instead...