This is how you do it, hydraulic valvelifters don't have a valvelash
Copied from the manual:
a . Initial Adjustment of Hydraulic Valv~
The initial adjustment of any hydraulic
valve lifter must be made only when the lifter
is on the camshaft base circle (off the cam) .
1. Crank engine over slowl y until distributor
rotor indicates that affected cylinder is in fir-
ing position, which places both lifters of this
cylinder on the camshaft base circle (off the
cam) , so that either lifter may be adjusted.
2. Turn adjusting ball stud as required until
all play of push rod between lifter and ball stud
is just removed, and there is no lash clearance
in the valve train.
3. Turn adjusting ball stud down exactly 2
turns. Check to make sure that oil groove on
ball stud is at least half way down in rocker
arm so that it connects with the drilled oil pas-
sage in rocker arm, then tighten the lock nu t .
4. If oil groove on ball stud is not at least
half wa y down in rocker arm, turn ball stud
down one additional turn (total 3 turns) and
tighten lock nut. If oil groove is still too high,
it will be necessary to install another push rod
5. When it is necessary to adjust all valve
lifters in an engine, time may be saved by
aligning the "D.D.C. 1-8" mark on flywheel
. with index mark in ti ming hole in flywheel
housing, firs t with No. 1 cylinder and later
with No. 8 cylinder in firing position as in di-
cated by position of distributor rotor. Adjust
lifters according to the following table :
-No.1 Cyl. Firing- - No. 8 Cyl. Firing-
Valve No. Va lve Val ve No. Valve
1 #1 Exh. 3 #2 Inlet
2 # 1 Inlet 5 #3 Exh.
4 # 2 Exh. 6 #3 Inlet
7 #4 Inlet 9 #5 Exh.
8 #4 E xh. 10 #5 Inlet
11 # 6 Inlet 13 #7 Exh.
12 #6 Exh. 15 #8 Inlet
14 #7 Inlet 16 # 8 E xh.