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While I do think it was engineered to be installed and serves a purpose (cooling is one, with the holes in it creating a breeze) I don't know if it will result in a catastrophic failure or anything that you left it off. I notice that the camshaft sprocket and the crankshaft sprocket both have sort of flared walls that act as a guide on the engine side of them, but there is no guide for the camshaft sprocket on the outside as there is for the crankshaft. On the V6 engine (that I have worked on) the camshaft sprockets go with the flare in toward the engine on one, and with the flare outward on the other one, kind of acting as a guide as the belt travels from one sprocket to the other. Long story short (too late now haha) if it messes up the belt, you'll have to go back into it to replace it - which is what you would have to basically do to replace the guide anyway - with no resulting damage to the engine if the belt messes up. It's obviously up to you, but I guess that if you want to try it out, there's not that much to lose with just holding onto the guide for now and replacing it the next time you perform this job. HTH
Tracy
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