Adjustable Rocker Arm Help....
Something's not right here, you should not be able to compress the lifter piston simply by using your hand and pushing down on the push rod end of the rocker, If this is what you're doing. The lifter should have hydraulically locked therefore the lifter is faulty and should be removed, disassembled and cleaned. Probably a piece of dirt. Also did you make sure that you were at TDC, beginning of power stroke when you set the valves on the cylinders, there is also a chart you can follow with a sequence you can use every 90 deg of crank rotation. BTW you should be able to compress the lifter piston, approx. 100-130 thou. but only when completely dry of oil.
Terry