PRW 33 PQ Series Aluminum SB Chevy Shaft Mount Rocker - Manual (Page 3)

Step 7: Install the rocker arms onto the rocker arm shaft one pair at a time.
a) If pushrod length has already been determined and pushrods installed, back the adjusters out
until the base of the adjuster seats against the rocker body.
b) If pushrod length has not been verified, please refer to the Section II – Special Instructions:
Pushrod Length; Checking to Determine Proper Length to ascertain the appropriate pushrod
lengths. Once completed, install the pushrods, and continue Step 7 as detailed below.
Make certain that the number 1 cylinder is at TDC and the pushrods are properly seated in the valve
lifter at one end and the valve lash adjuster at the other. The rocker arms should rest in the
pedestal/stand without any pressure between the valve lash adjuster and pushrod.
a) Install the 5/16” torx head bolts through the rocker shafts into the rocker stands; hand-tighten
until snug and then torque to 25 lbs/ft.
b) Upon installing the first pair of rocker arms, rotate the crankshaft 90 degrees and install the next
pair of rockers.
c) Follow the engine firing order until all rocker arms have been installed.
NOTE: Never attempt to install or remove rocker arm shaft machine screws while valve spring
pressure exerts a load. Attempting to do so may seriously damage the shaft or other component
parts.
Step 8: Place a few drops of oil on the valve lash adjuster threads prior to installation in each rocker
arm. Tighten the adjuster against the pushrod by hand until bottomed out. Back the adjuster out 1 turn.
Thread the adjuster nut onto the valve lash adjuster and tighten to 160-170 lbs/inch to seat the adjuster.
NOTE: It is critical that the adjuster is backed out one full turn before applying torque to the
adjuster lock nut. Failure to do so may result in damage to the adjuster and rocker arm.
Step 9: Once the valve lash adjuster has been seated, loosen the adjuster nut and set the adjuster for
valve lash. Retighten the adjuster nut to 140-150 lbs/inch.
NOTE: Do not run the rocker arm with the adjuster bottomed-out. Doing so will result in damage
to the rocker arm and other engine components.
Step 10: Using pump-style oil can against the oiling hole in the adjuster, pump the handle until oil
comes out of the oil passage behind the rocker arm roller tip.
Torque Specifications with Oil
7/16” Rocker Stand Bolts
42-44 Lbs/Ft (OEM Cast Iron Heads)
7/16” Rocker Stand Bolts
Consult Aluminum Cylinder Head Mfr Specs
5/16” Shaft Bolts 26-28 Lbs/Ft
3/8” 12 point Adjuster Nut 140-150 Lbs/Inch
7/16” LHCS Head Bolts OEM or Aftermarket Cylinder Head Mfr Torque Specs
WARNING:
1. Do not re-tap rocker body adjuster hole. Doing so will damage the rocker arm beyond repair!
2. Do not over-tighten adjuster nuts or modify adjuster counterbore!
3. Do not degrease rockers and/or run without proper lubrication.
4. Do not run valve lash adjusting screw out past two threads from seated position!
5. Do not allow pushrods to come in contact with cylinder head!
6. Do not run with rough or damaged pushrod tips!
7. Do not loosen shaft bolts under spring loads!