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You can see the ARP studs here with the precision ground and hardened washer that helps ensure accurate torque readings. Since these are not torque to yield fasteners they can be reused many times and you do not need to use angular torque to tighten them.
After the studs and nuts were lubricated which is essential for proper torque readings, the studs were torqued down to spec in 3 steps in an “X” pattern from the middle outward.
Our WPC treated cams were laid in place. Since Nissan controls the valve clearance using select fit buckets, we would have to confirm the valve clearance and change buckets out to get the right clearances.
The cam caps were put in place and torqued down sequentially from the inside out. Care has to be taken to do this gradually in steps or you can risk breaking the chilled iron cams.
The cam caps were then torqued down to spec and the valve clearances checked. Surprisingly we only had to switch out a few cam buckets for thinner ones as the machine shop had to remove very little material when doing the valve job.
Next, the chain tensioners and guides were bolted to the head.
