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We're using a 7/16-14 thread tap installed into a battery-operated drillto clean all 34 cylinder-head bolt holes to remove crud and old threadsealer. Set the drill torque load to the medium setting to avoidbreaking the tap. Then we use compressed air to blow out all of the boltholes. This is also a good time to check the condition of all the boltthreads before the block is assembled. View Related Article
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