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Good afternoon...Fresh Head Gaskets need to be re-tightened several times in order to hold the torque of 55 pounds or a bit more if you have a high compression head. The gasket will compress and thus the poundage will drop. At perhaps 2 hours, 8 hours and 20 hours running time, re-torque the head...just put the torque wrench on the nuts and give a firm pull until the wrench clicks...A loose head will contribute to warm running by allowing coolant to mix with the head from the exhaust valves...Ernie in Arizona