Usually, these engines don't need adjustment.
Just measure your current clearances and then measure your shims. You may just need fresh rubber "hushers".
You may be able to shuffle some existing shims around, and then only need to by a handful of new shims. They're not *that* expensive.
I'm sort of against pulling shims in the yard for a few reasons: You'll probably need to pull apart several heads.... and then the heads are basically ruined for anyone else to use.
-Ryan
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Athens, Ohio 1987 245 DL 324k, Dog-hauler 1990 245 DL 142k M47, E-codes, GT Sways/Braces, Dracos, A-cam 1990 744GLE 189K 16-valve 1991 745 GL 304k
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