You adjust the JV's to .010", but why bother? They are an accident waiting to happen. It's not a lot of work to put in the JV eliminators, which are a bolt looking thing with an oring seal. You take off the cam sprocket and let the sprocket rest on the little metal shelf just below it. Then remove the rocker arm shaft cap bolts, loosening each a little at a time to avoid having valve spring pressure bend the shafts, until the spring load is off. Use cut off rubber glove fingers to hold the hydraulic lash adjusters in the rocker arms. Lift off the rocker shafts and rockers, leaving the 4 end bolts in the caps to retain all the assemblies on the shafts. Remove the jet valves from above, unscrewing with a deep well socket, making sure all the parts come out with the JV, especially the head and valve stem. Install the JV eliminators, and reinstall is the reverse of the take apart, except use a smear of rtv on the mating surface of the top and bottom halves of the rear cam bearing cap, and reseal the circular cam bore plug to the head and rear cam bearing cap. By the time you rotate the engine, and set a JV, and rotate the motor again, and adjust another one, you have the problem solved by eliminating the damn jv's altogether.