When I installed my exhaust on my new engine I used new Rapco 77611 gaskets on each flange. After an hour of operation I noted some white blow by on the bottom of three cylinders directed towards the spark plug. Is this just a torque issue or can I reinstall these gaskets wet with some high temp RTV? I torqued the exhaust nuts I could get the wrench on to 180 in-lbs, for reference.