Here's a quote from a 70's Chevy service manual.
<BLOCKQUOTE>quote:</font><HR>Valve adjustment is made by backing off the adjusting nut (rocker arm stud nut) until there is play in the push rod and then tighten nut to just remove all push rod to rocker arm clearance. This may be determined by rotating push rod with fingers as nut is tightened (fig. 3V). When push rod does not readily move in relation to the rocker arm, the clearance has been eliminated. The adjusting nut should then be tightened an additional 1 turn to place the hydraulic lifter plunger in the center of its travel. No other adjustment is required.<HR></BLOCKQUOTE>
You can see from this that adjusting the lifter is not to remove noise etc but to center the lifter plunger for proper operation. If it requires 1 turn and you go 1/2 or 3/4 turn, then the lifters are not properly adjusted.
If I were you I would get a service manual before I took anything a gospel. What I quoted if from a 1970 Chevrolet service manual, I doubt much would have changed in 7 yrs as I use this same procedure in late 70's truck engines I upgraded the cams in.
[This message has been edited by elcamino (edited 04-12-2002).]