86-93 B2200s stock have hydraulic lash adjustors, these are kind of like a shock absorber and should be in constant contact with the valve stem, the hydraulics automatically compensate when being compressed by thermal expansion of the parts so no adjustment is needed nore possable.
Some older B2000s had a mechanical rocker arm setup, these do need lash. They can be identified by having a threaded rod going through the rocker arm which is in contact with the valve stem. There is a slot in the top for a flat head screw driver and a 12mm nut for adjustment. Stock specification is .008" lash between the lash adjustor and valve stem tip. I highly recommend between .006-.007" on the intakes and .007-.008 on the exhaust. It's better to be a little tighter then a little loose.
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