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

without any pressure between the valve lash adjuster and pushrod. Install the 5/16” torx head bolts
through the rocker shafts into the rocker stands; hand-tighten until snug and then torque to 140-150
lbs/inch. Upon installing the first pair of rocker arms, rotate the crankshaft 90 degrees and install the next
pair of rockers. 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 a 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.
Pushrods; Checking to Determine Proper Length
1. With the number 1 cylinder at TDC (Top Dead Center) seat the provided pushrod length checkers
in both exhaust and intake valve lifters.
a. The base circle may be different between the intake and exhaust camshaft profiles.
b. It is necessary to check both for proper individual pushrod length.
2. With the valve lifter on camshaft base circle and valve lash adjuster rotated clockwise 1 turn out
from the seated position, install the rocker pair over the number one cylinder with the length
checkers in place. You may wish to mark the checkers “I” and “E” (for intake and exhaust) to
easily identify after removal.
3. Tighten the torx machine screws through the shaft and into the stand until snug.
a. Do not attempt to install or remove rocker arms under load.
b. To do so will likely result in serious damage to rocker arm shaft, bearings, and/or the
rocker body.
4. Adjust the pushrod length checkers to required fitment and proper length.
a. Remove the rocker pair from the stand and then remove the pushrod length checkers.
b. Record the lengths required for reference and order the appropriate quality Intake and
Exhaust pushrods from your Racing and Performance parts dealer.
NOTE: Maximum recommended spring pressures for the PQ
2
Shaft Mount Rocker Arms are 275 lbs
closed; and 700 lbs open. The rocker arms will clear up to 1.550” diameter valve spring. Pushrods
selection is important; these are critical parts. High quality aftermarket 4130 chromoly steel pushrods
are recommended. Custom length pushrods are readily available from PRW through your local dealer.
Post Installation Maintenance:
The synchronized oil system must be inspected periodically for obstructions that may prevent proper
rocker arm oiling. After the valve has been adjusted to camshaft specifications, verify that the 12 pt
adjuster nut has retained 140-150 lbs/inch torque.
NOTE: Severe engine damage may occur if the adjuster nut comes loose while the engine is operating.
Torque Specifications with Oil
7/16” LHCS Rocker Stand Bolts
42-44 Lbs/Ft – OEM Cast Iron Cyl Heads