Are the lifters adjustable on the 5.9 liter engine?

Mine are getting a little noisy during startup. 70k miles. I use Mobil 1 syn. oil, and mobile 1 filters.

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You are referring to the rocker adjustment or valve lash.
Gasoline 360, no. Rockers are pedestal mounted, bolt torqued to 21 FtLbs.
Diesel 5.9 yes. Valve lash should be done cold, intake .006min-.015"max exhaust .015min-.030"max
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How often should this be checked/adjusted? ('03 HO) Couldn't find it in the manual.
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The 24V's were 100K... the HPCR's are at least that. Of course, it never hurts to check 'em early - as some have reported finding their rockers a bit on the 'loose' side of the spec.
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