Hello, swapped old log style to new sierra center rise exhaust, getting some water in the oil, does the hose routing change or thermostat housing? water seems to come from the center exhaust port and is sucked in thru valves, standard camshaft, all gaskets are good. testing this engine on a stand with a garden hose, to much pressure? tested engine with car headers and a radiator no water in the oil. Anybody had this issue? thanks for any advice.