No they are not hardened. It is a socket head set screw used with the pulley puller tool to act as a centering device. You get two washers and two set scews with the puller, so I suppose they only last for two pulls before you should throw them out to avoid breaking.
I will have to drill and use an extractor for both the Puller tool and the SC shaft.
Second modification you must make is the PCV system extension. If you look at the Gen V, and locate the EVAP sensor, look to the right, and you'll see a small nipple. This is part of your PCV system, this MUST be utilized, or you WILL have a vaccuum leak!! Below are your choices:
You can run a tube from this nipple, to the air intake, this inlet must be located behind the MAF sensor, but before your throttle butterfly. In the LS1/Northstar setups, this is easily done by threading a tube into the air intake between the MAF sensor and the throttle body. On the L67 throttle body, its alittle more involved. There is a brass plug on the bottom of the l67 tb, drill out the plug then tap it.
You can cap this nipple off, and run a breather on the front valve cover. (***NOTE*** This allows unmetered air to enter the PCV system, and may cause problems down the road)
For now I plan on simply plugging the port on the Gen V. What problems down the road will this cause
What did Rogue do
Not sure if I reroute the water injection nozzle to the lower manifold, what the effect of it only spraying from one side inbetween two adjacent ports across from two adjacent ports...
And I fear the challenge of drilling into the manifold.