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Message: [QUOTE="Mdub707, post: 906438, member: 107"] The H11's use a lower torque rating because the material they are made of has a higher tensile strength. So a lower torque value is used to obtain the same clamping force. The point isn't NOT to stretch... they ALL stretch. We want them to stretch a little, we don't want them to yield. Stretch is what gives the clamping force. H11's stretch, ARP's stretch, every single fastener on the truck is stretched, otherwise the clamping force is 0. Once you yield the material (snap a stud, or stretch beyond deformation) your clamping force becomes.... 0. We've had the discussion about torque values used on ARP's in the past. A lot of guys are going above what ARP specs of 215 ft/lbs using the ultra torque. No one can really give an answer as to why. It seems more go with the method of "bigger is better" without doing the math. A1 technologies (who produces the H11's) went out of business a few weeks ago, so H11's are going to dry up in a hurry. The only advantage I could see using the H11's over the ARP's is the lower torque value needed, and it would help those doing in-cab head gaskets. Has to be a lot easier torquing to 165 ft/lbs with the cab on. I have to ponder what people are doing with their trucks that some blow gaskets and others have no issues. How are these trucks maintained, how are they used, what other mods do they have, who's tuning are they running... I think there's too many questions to answer for most of us to get and definitive answers as to why some blow and others don't. I have a buddy (who may be on here, Karls03) who has an 03 6.0, been tuned for well over 50k miles, runs it in the 1/4 miles (ran like a 13.9 on Gearhead tunes) and sled pulls with it, all on stock bolts and been that way since the beginning. He swears by letting his truck warm up 100% before even getting on it at all. He will drive, but wont give it much for throttle until his temps are at 180* +. He's had no issues.... [/QUOTE]