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there is no adjustment you can do. the valves are topped by hydraulic lifters that the cam rides on directly. there is no rocker and no valve lash.
it's hard to definitely diagnose a "rattling" it could be dead lifters or something more serious. u'd need to pull off the cam tower to see.
as ppl have said before, if u want to turbo, buy a turbo car. it'd be cheaper.
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