I've been thinking and it seems no one has asked where a quart of oil per 200 miles is going. That much oil would cause the plugs to foul real fast, a big cloud of smoke should be following you every where, and the motor won't run right. The O. P. says the motor runs fine. Is there a quart of oil on the ground or sitting under the intake? That is a lot of oil, where is it going? Are you putting in 5 or 6 quarts to begin with? Is you dip stick accurate? A lot of good info on sealing the intake, but is this the real problem?