The one thing I found when I had a 2000 excursion was the manifolds were completely inadequate for towing. THEY ARE SUPER RESTRICTIVE,so to counter this I would let mine idle for about 5min to bring the manifold temp down. They expand and contract A LOT causing the bolts to break. I finally did the permanent fix by replacing with the GIBSON stainless headers. IT WAS EXPENSIVE TO DO but very worth it as I picked up 1.5-2 mpg all round and it ran completely different especially on the hills. I wish there was a cheap fix for yah.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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