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Message: [QUOTE="Maryland dieselnick, post: 1561679, member: 22661"] Thank you Tomlin. I did in fact, be the one who jumped into the then understood situation. My at the time with over 3 decades of experience over top of a degree from a place in Cambridge Massachusetts. I resolved the then “ misunderstood by some/ issue that was hoped to be an offset #s play out with production. Reality came down to on average .001-..002 difference in exhaust valve stem to exhaust valve guide clearance that made the difference between one truck or another. I was brought in after identifying the stem expansion/stiction issue. It became Oh S…! Well how can we do it on the cheap. Mmnnn.. No. You will not. We are accountable to the bean counters. We will try a flash that will not make the regen not as hot. Ok, will work for a few but it will not work across the board. Will not resold complete issue. It’s too tight. Well.. they tried a few different reflashes. Then it came back to the same. We are not going to have dealers sending heads out to bore open and try to bellmouth exhaust valve guides. Stick with the reflash and one comes back, they get the new heads, now with more stem to guide clearance to allow for the exhaust stem expansion during the blast furnace effect while open and not in it’s guide that would “ normally” act as a heat sink. As to Corey, the president of CNC Fabrication, which I have no affiliation with, I have watched that man grow that business from its infancy to what it is now with total knowledge of every aspect, honesty, truth and hard work. Frankly that means a very good bit. [/QUOTE]