High-Speed Steel Hand Tap & Wrench for 907 Cam Cover Bolts Housing.
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.