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Yeah...this is most worrisome for owners new to the S54 platform.
Most of the rattles you've mentioned comes from the exhaust hub tabs hitting/hammering the disc. If after performing a valve adjustment and validating the intake hub bolts are good, then consider doing the Beisan disc replacement. I did the entire Beisan seal/rattle kit and hub disc and it's very quiet now. Of course, there are still the ratcheting that is the nature of solid lifters, but much quieter now.
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