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He was probably the same engineer that designed the torx head bolt that goes down in the left center of the upper manifold on the 5.0FI engines. You have to use a torx bit on just the one bolt instead of a socket as on the other five. The problem is that they didn't make the gap thru the upper manifold above it large enough to get a 3/8" socket and extension thru. You have to use a little 1/4" torx bit and an assortment of 1/4" tools to get down there. I've got several taped together so I can reach down there without it coming apart when you use it.
I really don't care whether you need a torx bit or a socket for that particular bolt. The problem is that they didn't leave a large enough gap thru the upper manifold to reach it with normal tools.
What I use to remove the Torx bolt is a 1/4 hex drive Torx bit. I think it a T40 or T45. This is the type of hex bit that fits in a socket type screwdriver or nutdriver. I use a 1/4" drive size 1/4" socket, a 1/4 drive extension (or two) a 3/8 to 1/4 adaptor, and 3/8 drive ratchet or breaker bar. I tape the joints together to keep any of it from coming apart while you are down in the gap of the upper manifold. If anything falls off it's tough to get my big arms down under the upper manifold to retrieve it. You can't use any bits that are in their own sockets or any 3/8 drive sockets down there as the crack to work thru the upper manifold is too narrow. It's really not too bad after you do it enough times. I can have all the vacumn lines, hoses, and wires off and the manifold removed in about 20 minutes or so. Of course that doesn't include the other 30 minutes to find all of the tools I need that have gone into hiding after the last time I had it off.
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