Soak the rockers in 30 weight oil
for ½ hour. Molly coat roller tips and the ball tip on the
adjuster. Pushrod length adjuster should not exceed more
than 2 threads out of the bottom of the rocker arm. Do not
exceed 20 ft/lbs torque when
locking adjuster in place.
Valve Cover Clearance
Most applications will not clear
stock valve covers.
Follow this procedure before installing valve covers and
starting the engine:
Disconnect the coil, place the
cover in position without gaskets. Hold it in place with
your hand. Ask your assistant to turn over the engine
several times by engaging
the starter motor.
If the rockers
are hitting the
will feel the
Additional clearance may be
gained using taller aftermarket
Length of Pushrod
Pushrod length is determined
several factors and should
be established for each specific
application. Examples: Smaller circumference cam with higher
lift lobes = longer pushrods
Resurfaced head or decked
block = shorter pushrods Angle milling head = longer pushrods
taller than stock valve stems
= shorter pushrods
Valve Lash Settings
Follow cam manufacturer
will vary. Hydraulic cams with
stock rocker arms normally
require 1 full turn tighter
zero lash (no clatter).
rocker arms should be
tightened no more than ½
from zero lash.
Changing Rocker Arm Ratios
The amount of additional lift at the valve will be
determined initially by the amount of cam lobe lift.
with a 1.5:1 rocker is 0.600 at the valve, then lift with a
1.6:1 rocker will be 0.640.
Use this simple formula:
0.600/1.5:1 = 0.400 (cam lobe lift) x 1.6:1 = 0.640 (gross
lift). Lift increase = 0.040
Broken Rocker Arm
Typically, rocker arm breakage is due to another problem.
However, any breakage
that is due to manufacturing defects
and not abuse will be replaced or repaired. This excludes
any rocker arm modified from its original state.