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Message: [QUOTE="weekendwarriorfsw32, post: 552049, member: 771"] Well I guess I will chime in my 2 cents. I blew piston #8 pulling a grade with about 19k in tow was between 1,100 to 1,300 when I heard a pop and then a hiss, thought it was just another intercooler boot going but the noise I heard was boost going though the piston into the crankcase of my block that blew out glow plug harness # 6 and that oil coated the truck and toy hauler :flipa: Tore it down and found a chunk and crack out of #8 [ATTACH=full]102226[/ATTACH] I am torn between high EGT's cause fatigue over time because I have seen 1,600 down the track in a big tune or a cracked injector tip putting all the fuel and heat on one side of the piston as you can see by the black mark on the crack. For whats it's worth I was running the KEM 210 Tow tune when it blew and that is the tune that I always towed in. I have another truck in the shop right now with under 50,000 miles that I just did studs on 10,000 ago and he had no cracks or anything and now has a cracked #8 piston. He sled pulls his truck and races it HARD. He runs H&S Hot Damn tune and KEM 345, it blew getting on the freeway easy in the KEM tune he says. [ATTACH=full]102227[/ATTACH] I am Installing a set of Hallers coated International coated pistons into his truck as well. My theory is that there is so much of an unsupported lip and the heat and cylinder pressure being high is to much and stress crack come about and they only get worse from there or in my cause and injector tip was broken putting to much heat on one side of the piston, I could be way off but that's my theory on it. I was also concerned about the international pistons dropping the compression to much for cold weather starting but I talked to Dustin about and he sent me a cold weather vid and it took my doubts out of my mind. Last week I was up in the snow and the weather was very cold like in the -10's most of the time so I filmed a start up vid of it at -9 and it started just as it would at 60 degrees out side with just a split second of injector knock then it goes away. [url]http://www.youtube.com/watch?v=XW8V24Ngriw&feature=youtu.be[/url] [/QUOTE]