Thread Chaser for 907 Cam Tower
Why do you need to chase the cam tower housing threads when installing new, rubber camshaft cover gaskets?
The sucessful complete of this task rests on the premise that your cam cover bolts will be able to easily thread into the housing, since the gaskets slip into place as the cover is being secured. Dirty threads do not permit this to happen. You should be able to turn each cam cover bolt all the way down easily with your fingers, only needing to tighted up the last little bit with a wrench. The threads must be spotless! If needed, you must chase the threads with a tap like this to remove dirt and grunge.