billysobx
+1y
Did you re-torque Cusser? Here is what mazdatrucking says: "A second common reason for engine overheating within a year of replacing a head gasket is failure to retorque the head. Re-torquing the head must be done because of thermal expansion. When the engine gets up to full operating temperature the cylinder head expands and causes the head gasket to compress more than it would while the engine is cold. This causes the head gasket to permanently compress a certain amount which releases tension on the head bolts. To ensure this does not happen the head bolts must be retorqued after the engine has gone through a few heat cycles. A heat cycle is when the engine is operated up to full operating temperature and then allowed to cool down to ambient outside temperature. After you have ran the engine a few times and allowed it to cool remove the valve cover and set your torque wrench to the maximum head bolt torque listed above, then tighten each bolt in sequence. Never loosen a head bolt after the head gasket has been installed, doing so may cause the head gasket to blow." The only thing I can think of is, at the factory after assembly they run the engines for break-in procedure, pull the rocker arm cover and check the torque. Aluminum does expand and contract a lot more than cast iron, makes sense in a way.