You're wasting your time with a running adjustment attempt. When you loosen the adjuster enough to get a noise, the lifter is topped out against the snap ring, and it will take it some time to get back down to normal running height as it's tightened. In the meantime, the cylinder will miss.
With the engine stopped, and each cylinder at top dead center of the compression stroke, loosen the adjuster until there's slack, then tighten it slowly to remove the clearance, then tighten about 3/4 to 1 turn further. By the time you get through all 12 adjustments, the first ones will have bled down to the correct running height. Wait 15 minutes after the last valve is adjusted, and crank up. No mess, no fuss, and no noisy lifters. If this procedure doesn't work, invest 3 bucks each, and replace the lifters.
Jerry
