When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
if your replacing the intake you don't have to be careful with it, cut the head off with a sawzall, pull the intake over it and then it should come out easy.
+1 to all these suggestions. I'm not sure if you could fit the jaws in there, but I have had success using a plumber's pipe wrench. The one I have is about 8", and can get into most spots. If you put it on just right, the more you turn, the more it bites into the bolt. I have used it on probably a dozen stripped bolts and nuts over the years. Good luck.
Cut a slit in the head, and use a LARGE flathead screwdriver to get it out. Better still, get a LARGE flathead screwdriver bit and but it in an impact.
what went wrong with hammering a socket on? I'd lean more towards freezing than heating the bolt. CRC the makers of brake-kleen make some cryo freeze stuff in a can, try spraying it with that. I find pounding on a 12-point metric socket just smaller than what it's supposed to take works best, best with an impact gun to rattle it loose also.
I have done that myself and as long as you get good penetration it works well, otherwise you just torque the nut back off. If I don't have a welder handy, I find a pair of vice grips will work well too. Lock that s#!t down on there as hard as you can.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.