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  1. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    I am doing a thermostat replacement on a 2006 chevy 2500 with the 6.6L duramax. I know that I need the o-rings but I am also seeing a 4 bolt gasket. Is that 4 bolt gasket needed for the thermostat housing or do I only need the o-rings for the upper radiator pipe and the thermostats?