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DUE TO LITTLE CONTACT BETWEEN THE VALVE AND THE SEAT, WHERE BOTH ARE IN THEIR DEGREE OF SEATING, IF IT IS LESS THAN 0.8, THERE WILL NOT BE A GOOD SEAL AND MOST IMPORTANTLY, THE VALVE IS UNABLE TO DISSIPATE THE HEAT IN THE CYLINDER HEAD, GETTING MUCH HEATER THAN USUAL AND MAY BREAK!!!