How about "probably" for an answer?

I think you can take off the rocker assy, or at least loosen the bolts almost all the way, and get room to take out the lash adjusters. It's also possible to bleed the adjusters with a blunted pin. There's a tiny hole on top of the rocker, over the lash adjuster. Insert the pin to depress the check ball in the HLA and press down on the adjuster. This should vent any air. If you pull the adjusters, get about a pint of diesel fuel and a small pan/container about 1.5" deep. Put the adjusters in the pan and pump them while submerged in diesel fuel. This primes and flushes the adjusters. If you have one that won't pump, install a new one in it's place. You may have to depress the check ball to flush the HLA. Cleaning them in dexron may help them work better...